unite and there need evidence to be that vote. people need to decide it's time to fight and this is a war worth fighting. >> reporter: do you know what a hero your great-granddad is? >> yes. >> reporter: for all of those that have fought for our freedom, thank you. >> that's it for "the lead." here's wolf blitzer. happening now, breaking news, i'm with her. after delivering the news to bernie sanders, president obama delivers his biggest endorsement of hillary clinton. the president says he's fired up to join the clinton campaign out there on the campaign trail and the democrats are lining up their other big guns for a hard-hitting campaign. donald trump is facing trouble within his own party. key gop leaders are still withholding their support and some say his antics are

distracting. attack dog. senator elizabeth warren is one democrat who holds nothing back when going after donald trump. she's going to endorse hillary clinton tonight. could warren become hillary clinton's running mate? an isis american. a virginia man who joined isis and then defected appears in federal court on terror charges. why the first american isis fighter is captured on the battlefield and could be a gold mine for u.s. intelligence. i'm wolf blitzer. you're in "the situation room." breaking news, president obama endorses hillary clinton for president of the united states saying he doesn't think there's ever been someone so qualified to hold that office. the president says he's fired up and he'll start campaigning with hillary clinton next week in

wisconsin. clinton says she's honored and that she, too, is fired up and ready to go. the endorsement was released after the president met one-on-one in the oval office with bernie sanders. while sanders won't be moving into that office himself, he has vowed to help hillary clinton defeat donald trump and aides say sanders will keep pushing for his progressive agenda. donald trump reacted quickly tweeting, "obama just endorsed crooked hillary. he wants four more years of obama. nobody else does. trump today met with prominent republicans but he's still having trouble with key figures in his own party furious over his attacks on a latino judge. john kasich and scott walker suggest they may not endorse trump. kasich says trump has, quote, gotten worse since the race ended and house speaker paul ryan voices dismay. but what he calls trump's antics saying he hope trump can fix

this. i'll speak with democratic chris murphy and our correspondents, analysts and guests will have coverage of today's top stories. let's begin with the breaking news. president obama's endorsement of hillary clinton. let's go to our white house correspondent michelle kosinski. this follow as meeting between the president and bernie sanders. >> reporter: yes. he didn't waste any time. to see how this played out was truly remarkable. we have a presidential endorsement in a video, in a tweet put out by hillary clinton's campaign. we know it was recorded on tuesday and it's clear that the white house wanted to wait for this long discussion today with bernie sanders. now, what we didn't hear from him was i'm bowing out, i'm now supporting hillary clinton. he approached those things in essence saying that he will now work with her and the white house towards their unified goal of defeating donald trump. >> i congratulate hillary clinton. >> reporter: a presidential endorsement in the form of a slick campaign video released on

twitter. >> i know how hard this job can be. that's why i know hillary will be so good at it. in fact, i don't think there's ever been someone so qualified to hold this office. >> reporter: unity among democrats is what they are all looking for and that's the picture president obama was careful to protect side by side with bernie sanders today at the white house. but after more than the hour-long private discussion with president obama in the oval office, sanders said he's not leaving the race just yet. >> i will, of course, be competing in the d.c. primary which will be held next tuesday. we will continue doing everything that we can to oppose the drift which currently exists towards a form of society. >> reporter: he did suggest he sees the writing on the wall. >> and lee work as hard as i can to make sure donald trump

doesn't become president of the united states. >> reporter: and plans to meet with hillary clinton. >> i look forward to meeting with her in the near future to see how we can work together to defeat donald trump and to create a government which represents all of us and not just the 1%. >> reporter: the president going out of his way to praise the senator's hard fought battle. >> just like eight years ago, there are millions of americans, not just democrat, who have cast their ballots for the very first time. and a lot of that is thanks to senator bernie sanders. >> reporter: they want his supporters. many who right now are still saying bernie or bust. >> and you heard senator sanders say to all of you just a couple of hours ago how critically important it is that president obama be succeeded by somebody who shares our values. >> reporter: president obama now free to hit the campaign trail and will in a matter of days. >> i am fired up and i cannot

wait to get out there and campaign for hillary. >> reporter: also on twitter today, donald trump. obama just endorsed crooked hillary. he wants four more years of obama but nobody else does. hillary clinton responding simply "delete your account." sanders met with top democrats and they want to hear him out, find out what he wants, what does he see as best to rally as many supporters and obtain that party unity. what we could see in the coming days is a rollout of endorsements from the vice president and even from the first lady, wolf. >> we'll be watching closely with you. thank you. let's bring in our senior washington correspondent jeff zeleny. jeff, bernie sanders made the rounds in washington and says he'll still compete in next week's primary next tuesday in washington, d.c., and what are his plans going forward? >> he's still campaigning to a point. he'll hold a rally tonight in

washington, d.c., but he clearly has made a central pivot in this campaign. top of the order here -- the first order of business is bringing his supporters on board, like michelle just said there. he can join this. but the reality is, one of his attractive features to all of these supporters is that he was an outsider so they know part of these discussions were how can you bring these people on board so they don't either, a, stay home or, b, vote for an independent candidate or a green party candidate or someone else who is running. so, wolf, central to that is firing these people up. i was struck by something that bernie sanders said right when he walked out of the white house about president obama. >> let me begin by thanking president obama and thanking vice president biden for the degree of impartiality they established during the course of this entire process, what they said in the beginning is that

they would not put their thumb on the scales and, in fact, they kept their word and i appreciate that very, very much. >> wolf, that was a message to his supporters as well because many who i talked to over the last many months believe that the white house was essentially supporting his opponent. but he clearly made the point clear that he appreciated the respect that was shown to him. in winning 22 states, it's given him a bit of leverage here. one of the key reasons for falling in line, he probably gets the team player award. bernie sanders will become a chairman of a major committee, likely the budget committee. at least potentially the budget committee. those are things that have been talked about. that's one reason for him to go back to his day job with a smile on his face. the clinton campaign wants him to hit the campaign trail pretty quickly and their meeting will likely come after the d.c.

primary. wolf? >> let's see what happen after that. thank you very much, jeff zeleny. joining me is chris murphy of connecticut. senator, thanks for joining us. you believe it's time for senator sanders to step down and end his bid for the white house? >> i think he's made it clear that his priority is defeating donald trump. there's one more primary to go but i think the rhetorical shift has already happened. i think this is going to be a very, very powerful image to have, hillary clinton and barack obama campaigning together next week in wisconsin and perhaps the week after to have hillary clinton and bernie sanders campaigning together throughout the country to the extent that there are any lingering, undecided progressive or democratic voters, donald trump will be a tremendous unifying factor. his sort of proud overt racism is something that is going to drive all of bernie supporters

who may be a little reluctant to get into the tent into hillary's camp. >> are you saying within two weeks or so you think that bernie sanders and hillary clinton could be out on the campaign trail together? he campaigning for her? >> i hope so. i think there's still going to be some important things that he wants to bring to the convention. once we are finished with all of the voting, he and his supporters have said that would be the moment to come together. so i'm hopeful that senator anders will be out there as quickly as possible. you can hear that there may not be a need to wait for the convention to have the unifying moment. >> as you know, there's a lot of anger among many of bernie supporters. what does president obama, hillary clinton, what do they need to do to get those millions of specially young bernie sanders supporters on board to back hillary? >> as you know, as one of the youngest members of the senate,

which is, of course, a relative term, i care deeply about making sure that young voters turn out and i think the rhetoric has been so powerful, maybe they haven't listened to some of the proposals that hillary clinton has made and maybe now after he gets on board with her campaign they will hear the things she's saying about college affordability and progressive issues like paid family sick leave. again, they are going to take a seconds look at donald trump. younger voters which care about tolerance, justice, inclusiveness are going to turn out for hillary clinton and turn out at the polls, also because they reject all of the divisive rhetoric that is going to be the foundation for the trump campaign.

>> donald trump has run an unconventional campaign. is hillary clinton underestimated him and his tactics? >> i don't think that. this is a country in which 45% of the electorate is solidly red and blue. you're arguing about 10% in the middle. i don't think she's under estimating at all. this is going to be a challenge in that he's going to literally make up new things about her every single day so she's going to have to be very aggressive in the rapid response to correct the record and she's going to have to be helped by the media which have done a much better job in realtime calling out trump when he's latying about

others. up next, donald trump is facing serious doubts dissent within his own party. some are demanding that he clean up. we'll have details. we were born 100 years ago into a new american century. born with a hunger to fly and a passion to build something better. and what an amazing time it's been, decade after decade of innovation, inspiration and wonder. so, we say thank you america for a century of trust, for the privilege of flying higher and higher, together. ♪

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we're following today's breaking news in the presidential race. president obama announcing his endorsement of hillary clinton. let's bring in our cnn political commentator peter beinart, contributing editor at the atlantic media. chief political analyst gloria

borger, ryan lizza, washington correspondent and executive editor mark preston. gloria, today's engorsmedorseme expected but what kind of impact do you think it will have? >> well, the timing is that it couldn't happen fast enough as far as the president was concerned and orchestrated properly, you see the president walking with bernie at the white house, sanders meeting with the vice president talking to hillary clinton this was kind of soft dip employee see at work and bernie sanders coming out and talking about defeating donald trump and i think they want to get on the same page and the president is just itching to get out there and we've seen that during recent appearances. he's been talking about donald

trump and you can see that he wants to get out on the campaign trail. this is his legacy and it lies with hillary clinton. >> mark, what do you think of the future plans? >> well, certainly the meeting with barack obama is being viewed internally as a very good meeting. they were happy with the outcome. they knew the endorsement was coming. as far as going forward, people are looking at bernie sanders as a real team player. now the question is going forward the next couple of weeks, wolf, with bernie sanders giving to the clintons his endorsement and not fighting if, looking at policy issues, the drafting platform committee is meeting here in washington.

there will be a few more meetings. see if he can push the democratic agenda more to the left as he would choose to do so. here's insider information. there's been a lot made of whether bernie sanders can take out debbie wasserman schultz. one thing we should be looking for is whether the clinton campaign will replace former representative barney frank as well as connecticut governor malloy as the rules committee. they are very upset -- the sanders campaign is very upset at these two gentlemen because he feels that they unfairly attacked bernie sanders and don't want them on the rules committee. >> mark, thank you. interesting stuff. peter, president obama will be visiting hillary clinton out on the campaign trail next wednesday in wisconsin. how strongly would you expect

him to come out against donald trump during that appearance and subsequent appearances? >> extremely strongly. and i think you'll see with a lot of humor as well, remember what barack obama did at the white house correspondents' dinner, where he mocked him. one of the real advantages that hillary clinton has in this race is she has stronger surrogates. barack obama will be a very aggressive attacker of donald trump. donald trump goes on himself a lot but a lot of republicans, most republicans, even those who have endorsed him, who don't want to go out there and be attached to him at the hip and that's an advantage for hillary clinton. >> ryan, when would you expect a vice presidential pick on hillary clinton's part? >> well, the traditional time to

do that is right before the convention. of course, the convention this cycle are a little earlier. so sometime in early july i would expect that we'll start to hear that. only a few big moments in a race when everyone is paying attention. vice presidential pick, convention and debates. and it will tell us a lot about what kind of campaign she's going to run. is she going to go left and play up the base or is she going to try and grab some of the disaffected republicans and maybe point to someone who is a centrist. >> ryan, i understand you have an article coming out in the new yorker, that he or she is not ruling out voting for hillary clinton. tell us about that. >> senator susan collins of maine tells me that she's opened to voting for hillary clinton.

she says it's unlikely but this is the first really high-ranking republican who has actually said that they could vote for hillary clinton. even lindsey graham and ben sass and people that are really, really anti-trump have said they would never, ever consider voting for hillary clinton but susan collins, the maine moderate, she tells me that she's leaving that option open. >> very interesting stuff. i know our viewers will want to read more about that in the new yorker magazine. just ahead, more on donald trump's meeting with big donors including the one he used to score in during the primary campaign. can he get them to open up their checkbooks right now?

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breaking news, president obama has endorsed hillary clinton for president saying he doesn't think there's ever been someone so qualified for the office. donald trump scoffed at the move and said "obama just endorsed crooked hillary. he wants four more years of obama but nobody else does." let's turn to sara murray. trump is having some trouble firming up support within his own party. what's the latest? >> that's right. donald trump has been taking swipes this afternoon at hillary clinton on twitter over this endorsement from president obama but the reality is it's the republicans having this difficult time rallying behind their nominee and we're hearing from more and more republican leaders that they aren't sure if

they will ever be able to back trump. some republicans just aren't ready to commit to donald trump. >> why would i feel compelled to support somebody whose positions i fundamentally disagree with. >> reporter: today, trump continues to face fallout for attacks against a federal judge because of his mexican heritage. >> i have a judge who is a hater of donald trump. a hater. he's a hater. his name is gonzalo curiel. >> reporter: saying he's still waiting for trump to renounce his prior criticism of the judge. >> they will be watching these others closely to see what happens going forward. >> it's sad that we have such poor choices right now. >> reporter: even house speaker paul ryan who has been pushing private unity kept up his criticism today. >> there's no just fiing those comments and i have very clear

about that. not just republicans should disavow comments like that. i'm glad he walked it back. this is a long campaign with a long way to go and he has a ways to go to give us a campaign that we can all be proud of. >> all of this as trump backers in washington are struggling to calm the storm. >> trump is learning how to be a candidate. nobody has ever done what trump has done. come from totally outside, never run for office. >> last week was a distraction. i believe mr. trump realizes that as well. >> but trump's tirades aren't the only thing giving them heartburn. after bashing big donors -- >> once you take that money, you can take control. >> reporter: trump allies, including reince priebus and chris christie huddled with top fundraisers. this meeting coming as trump dismisses the idea that he needs to raise a billion dollars for the general election and as some republicans grow anxious about whether trump can get the cash that he needs for the fall.

now, fundraising hasn't been the only snag in building out donald trump's machinery. he has a patchwork of aides across these battleground states that are pivotal in the fall. trump doesn't have so much as a state director. he and his aides are brushing that aside saying that the rnc has an organization and we're going to lean on them to help us get through november. wolf? >> sara, thank you. joining us now, darrell issa of california. he has endorsed donald trump. congressman, thanks very much for joining us. as you know, the speaker of the house, paul ryan, called trump's antics and said they were distracting in a radio interview and went on to say this. but i think and hope and believe he can fix this to the point where he can hopefully run a campaign that we can all be proud of. as you know, we've already seen how he runs a campaign defeating 19 republican challengers. why would you expect him to

change his strategy in a general election campaign? >> well, because he has to. and one thing i know about business from my background is that the necessity of what it takes to win often changes how people work. you saw this in donald trump's prepared teleprompter speech delivered very well, very thoughtful speech that he had gone through line by line. if he continues to do that, he very quickly changes from that amateur candidate professional businessman candidate to somebody who begins to show the ability to deliver to the world these meaningful speeches. >> republican leaders are currently attending mitt romney's annual summit in park city utah. you told me that romney, quote, needs to get over the fact that somebody he didn't pick won. the big picture right now, where does romney fit in along with the others who feel they've been alienated within their own party and they say they don't think they could ever support trump? >> well, as long as someone says

they are not able to support somebody, it's hard for them to be invited into the consulting circle. but assuming that mitt romney wants to make a difference, as so many of us do, including the speaker, they have to be willing to engage with donald trump, expect to have the kind of direct access necessary to be heard and then give thoughtful comments to the candidate and see if in fact he takes the kind of advice that a first-time candidate absolutely needs. >> romney hasn't softened his criticism of trump at all. he's tried to recruit a third-party challenger. he says he won't run but do you think he might try to continue to stop trump either by going after fund-raisers or dedicating the support elsewhere, maybe even to hillary clinton? >> well, that would be a sad thing for him to join barack obama in endorsing a candidate who is under active fbi

investigation. you know, this is the first time in history that a seated president has said that they not only endorse but will campaign for somebody. well, that president, attorney general and director of the fbi is actively investing valid criminal charges, ones in which people have taken the fifth and granted immunity to get information from people who clearly did wrong. so, on one hand, we have a criminal situation. on the other hand, we have a first-time candidate trying to come from absolutely outside the system and who has succeeded in becoming our nominee and now needs to succeed in unifying the party. we saw h. ross perot come from the outside and get 19% but to come from the inside and unify the party is a tall order and one that donald trump has to keep doing what he did in that prepared speech and not what he's done at times.

>> the maine senator susan collins is thinking about supporting hillary clinton over donald trump. should more republicans follow? should they go out and say they can't support trump and vote for hillary clinton? what does the party do? does the party have a plan to combat that? >> well, i view all of us as americans and if any american, be it republican or independent, looks at hillary clinton and the clinton operation that has gained net $371 million there at the clinton foundation, pays the family large amounts of money, chelsea alone, $600,000 for money geared leveraging their time in office and her time as secretary of state commingling those activities, i think they make a decision that even if she's never indicted, that this is not somebody you want to give

the ability to leverage public power to private gain because clearly hillary and bill clinton and chelsea have been doing that for years now quite successfully. >> it was the new yorker magazine that ryan lizza is reporting in. elizabeth warren, the senator from massachusetts, the democrat, she's doing her best to tie other republicans right now to donald trump. it looks like this is going to be part of the democratic playbook. what do they need to do if they want to get re-elected? >> first of all, you don't run from the principles of the party. you can in fact, differentiate based on your voting record. wolf, i've been traveling around the world and voting in congress on behalf of our nation for almost 16 years. when i go home, i'm not talking about donald trump or even hillary clinton.

i'm talking about the work we do in congress and the work yet to be done not the least of which is dealing with the middle east that is falling apart based on the wrong-minded thinking of the last eight years. >> that's it. that's all the time we have. congressman, thanks very much for joining us. >> thank you, wolf. >> darrell issa of california. tomorrow i'll be sitting down with the 2012 republican presidential nominee mitt romney to discuss, among other things, his opposition to donald trump, his fundraising efforts for the republican party. it's an interview you won't want to miss tomorrow. 5:00 p.m. eastern right here in "the situation room." and coming up, more on the breaking news. a source now telling cnn, the democratic senator, elizabeth warren, could be clinton's running mate. and later, an american who joined isis and then changed his mind ran away from the terror group. he goes before a u.s. judge.

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how do robots work? ♪ you need a team... ...working together... ♪ ...doing all kinds of jobs. and the best place to find the job that's right for you is on the world's number-one job site. indeed. how the world works. we're following the breaking news. not only is president obama endorsing hillary clinton, a source close to massachusetts senator elizabeth warren says she will endorse hillary clinton tonight as well. warren, who many democrats see as a potential clinton running mate, also will be delivering a high-profile speech in which she will continue to attack donald trump. let's bring in cnn's sunlen

serfaty. she seems to be filling a traditional running mate role, a political attack dog. >> that's right. she's become one of the most aggressive criticizers of donald trump. tonight she is set to deliver one of the most aggressive attacks yet on him and tonight here as she readies that attack on donald trump, she's readying here endorsement of hillary clinton. that role as the party's de-facto attack dog, just one role of many. tonight, elizabeth warren is being fully unleashed. >> thank you. >> reporter: ripping in to donald trump, calling him, according to prepared remarks, a loud, nasty, thin-skinned fraud who has never risked anything for anyone and has never served anyone but himself. attempting to tie all republicans to their presumptive nominee and his controversies,

like those over judge curiel's ethnicity. warren will say, "trump is a mitch mcconnell kind of candidate and house speaker ryan's type of candidate." warren, only a first-term senator, has acquired an oversized importance to democrats and seems pivotal in their quest to win the white house. >> i think elizabeth warren is very smart. >> she's a very good friend of mine. >> reporter: so far, the elizabeth warren factor is alive and strong. there's elizabeth warren, the attack dog, already on full display. >> i say we throw donald trump down the drain. >> reporter: unapologetic. >> donald, it's time to put on your big boy pants. >> reporter: and unfiltered in her aggressive and systematic takedowns of donald trump. >> this small, insecure money

grubber who just doesn't care about anyone but themselves. >> reporter: keeping up the trump offensive. >> it's pocahontas, elizabeth warren. she's a goofas. have you ever seen her? this woman, she's a basket case. >> reporter: and then there's the elizabeth warren, the peacemaker. key in helping to unify the democratic party after their fractious primary fight. >> i'm proud to be part of this election and proud of the debate that bernie sanders and hillary clinton have had. >> reporter: warren is known as a progressive superstar with a powerful following, especially among supporters of bernie sanders and seen as essential to help bridge the divide between sanders and clinton supporters. >> elizabeth warren, i think, has been a real champion in standing up for working families and taking on wall street.

>> reporter: then there's the question of elizabeth warren, the running mate as clinton starts to search for a vice president. >> i have the highest regard for senator warren. >> reporter: progressive democrats are energized. >> i think two women, whoever they may be, that would be fabulous. >> reporter: intrigued with the idea that not only could clinton call warren up but at the prospect of a an all female ticket. >> i think they would be as good as two men. >> reporter: and warren has been coy when asked about this buzz around her name. she says that she is squarely focused on her job in the senate and at this time she's not looking for another job. wolf? >> sunlen, thank you very much. coming up, a young man who grew up only miles from the nation's capital and was captured after fighting with isis goes to court facing decades behind bars. you both have a

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a virginia man who joined and then defected from isis appears in federal court hours after being flown back to the united states to stand trial. brian todd was in court with the young man when he stood before the judge. brian, what can you tell us? >> reporter: we were a few feet as he was led into the court by u.s. marshals. he came in looking thin and scared, gave his family a penetrating glance, then heard charges against him. his family was happy to see him alive, realizing how dangerous his defection from isis was.

>> where are you from? >> united states. >> reporter: he is the first american fighter with isis to be captured on the battlefield. he is charged with providing material support to isis, a terror group that officials say he wanted to join, then soured on. >> i didn't really suppor their ideology and that's, at that point that's when i decided i needed to escape. >> reporter: after his dramatic capture by kurdish forces in march, he did an interview with kurdish tv. we don't know whether he was coerced at the time of filming, he talked about how he flew from the u.s. to london, made his way to turkey. while there, met up with at least two women, one of whom helped him get into syria and then iraq. >> i made a bad decision to go with the girl and go to mosul.

at the time i made a decision to go because i wasn't thinking straight and on the way there i regretted, i wanted to go back. >> reporter: prosecutors asked if he wanted to be a suicide bomber, he answered yes but thought it was to test his commitment to isis. the isis lawyer downplayed it. >> i have no reason to think he wanted to end his life. >> reporter: when cnn went to his home in march, his father was upset with the media attention. today again he didn't feel like saying much. he graduated in virginia in 2007. a friend from high school says he was a normal teenager who made fun of people who were religious. >> what do you make of this news about your friend? >> it is really upsetting, really sucks, something you feel

for his family. just not something that you would ever think would happen. definitely wasn't the type of person, wasn't an angry person, wasn't an outcast by any means. he was just a normal guy, we did normal stuff in high school. >> reporter: tonight, analysts say he could be a gold mine for u.s. intelligence. >> he has interesting information about the recruiting process, training process, other recruits that were there. >> reporter: his attorney would not say whether his client would cooperate with prosecutors or u.s. intelligence. if con investigated, he could get 20 years in prison and $250,000 fine. our analyst says right now he is lucky to be alive. when they catch fighters that try to defect, they kill them. wolf? >> brian, have you found out why he became attracted to isis to begin with? >> reporter: wolf, there's little to indicate what attracted him.

prosecutors say he did admit watching several isis videos before he left the u.s., including videos of executions. he told the fbi he gave himself to isis and they controlled him. his lawyer cautioned us today saying that everything is not as it appears in the government's court records and he looks forward to telling their side of it. >> brian todd, thank you very much for that report. coming up, after breaking news, president obama endorses hillary clinton saying he is fired up to join her on the campaign trail. and donald trump is still facing trouble within his own party. some key republican leaders are withholding their support, warning trump to basically clean up his act. this is my body of proof. proof of less joint pain and clearer skin. this is my body of proof that i can fight psoriatic arthritis with humira. humira works by targeting and helping to block a specific

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happening now. breaking news. seal of approval. president obama endorses hillary clinton moments after meeting with bernie sanders at the white house. president obama and hillary clinton now scheduled to hit the campaign trail together. can they unify a divided democratic party? delete your account. hillary clinton fires back at donald trump on social media after he slams her presidential endorsement. their exchange foreshadowing what's expected to be a nasty general election fight. can clinton win a twitter war with trump. calming the storm. trump meets with top donors and the gop chairman as he tries to ease growing anxiety among republicans, but the never trump movement is once again gaining some strength. are party leaders gathering a new strategy to deny trump the

nomination? to our viewers in the u.s. and around the world, i'm wolf blitzer, you're in "the situation room." the breaking news, powerful backing from a one time rival. president obama making a hearty endorsement of hillary clinton. the clinton campaign releasing a video of president obama offering his support saying, and i am quoting now, i'm with her, i'm fired up and i can't wait to campaign with her. the endorsement came just hours after the president met with bernie sanders at the white house in what was described as a very good and positive meeting afterward. sanders said he will continue to compete in tuesday's washington, d.c. primary but also said he will work closely with clinton to stop donald trump from becoming president. the presumptive gop nominee took to twitter to slam president obama's endorsement of clinton. trump is out working to reassure

republicans unnerved by his controversy plagued campaign. he met with campaign donors as he faces criticism for racial attacks on a judge in a trump university lawsuit. we're covering all of that and more this hour with our guests, including hillary clinton's campaign chairman, john poe did he say tow. let's begin with breaking news. historic breaking news today. our senior washington correspondent jeff zeleny is joining us. jeff, the president's endorsement of hillary clinton came in a video. >> reporter: wolf, this brings the relationship between barack obama and hillary clinton from rivals to friends full circle tonight. he has been eager to jump into the race from the start and start going after donald trump and now he will do that. bernie sanders just left the vice president's residence a few moments ago after meeting with him privately as well, on a day washington democrats fell into

line to focus on the battle ahead. >> i want to congratulate hillary clinton making history. >> reporter: on the sidelines no more, president obama offered endorsement tonight of hillary clinton. >> i don't think there's ever been someone so qualified to hold this office. and i'm with her. i am fired up and i cannot wait to get out there and campaign for hillary. >> reporter: hillary clinton welcoming the news, honored to have you with me, potus, i am fired up and ready to go. united around the idea of stopping donald trump. the president's blessing hours after meeting with bernie sanders today in the oval office. that visit included a walk on the white house colony. usually for heads of state. >> let me begin thanking president obama and vice president biden for the degree of impartiality they established during the course of this entire

process. >> senator, welcome back. >> reporter: sanders is returning to a place democratic leaders want him, back on capitol hill, meeting with senate democratic leader harry reid and others. >> i don't think bernie sanders is holding out for anything. i think he is somebody that's interested in changing the direction of the country. >> reporter: it was a day long sign of respect and leverage for sanders after winning 22 states and aggressively challenging clinton. sanders didn't directly address plans to suspend his campaign but did signal he is ready to unite democrats against the presumptive republican nominee. >> needless to say i am going to do everything in my power and i will work as hard as i can to make sure that donald trump does not become president of the united states. >> reporter: trump also taking it all in, tweeting obama just endorsed crooked hillary. he wants four more years of obama but nobody else does. clinton firing back, delete your account. rivals for a year, sanders and

clinton will soon come together. >> i look forward to meeting with her in the near future. >> reporter: clinton wants and needs his help, particularly firing up voters as he did across the country. >> i am looking forward to working with him to achieve our common goal which is to defeat donald trump and senator sanders has said he'll work every day every week to see that happen. >> reporter: tonight, wolf, elizabeth warren will add her voice to the democrats supporting clinton. the massachusetts senator has been on the sidelines through the whole race and is eager to jump in. she's already aggressively attacking donald trump and will do so tonight in a speech in washington. sanders stopped short of endorsement himself, but is likely to meet with his former rival soon and get behind that clinton candidacy. the question is whether his supporters that spent the last year behind him against clinton will take queues from sanders, wolf, or go their own way.

>> great question. important one indeed. donald trump reacted to president obama's endorsement of hillary clinton almost immediately, mocking it on twitter. phil mattingly is covering the trump campaign. phil, there's still a lot of anxiety about trump. what's the latest? >> as the democratic party moves quickly to come together, the gop is facing struggles. wolf, it is a tension that goes beyond capitol hill, it is governors, state lawmakers, donors. it is a party that desperately wants to shift into general election fight against hillary clinton, if only the candidate will let them. >> reporter: donald trump today huddling with top donors and reince priebus, part of an effort to quell growing unease within the gop. >> i understand the possibility of carrying the mantle. >> reporter: top republicans are on the fence over his attacks of

ethnicity on the judge in the class action lawsuit related to the now defunct trump university. >> i hope he renounces what he said, i will be watching as others will, we will see what happens going forward. >> reporter: ohio governor john kasich wary of throwing his support behind trump. >> you don't even sound like you're on the fence. >> no, i'm giving him a chance. >> doesn't sound like it. >> he is trending the wrong way with me. >> reporter: house speaker paul ryan is again voicing frustration with trump's actions, even as he sticks by the presumptive gop nominee. >> do i think these antics are distracting and give us a campaign we cannot be proud of, yeah. i have spoken very clearly about it. i think and hope and believe he can fix this to the point he can run a campaign we can all be proud of. >> reporter: trump is facing very real concern over his ability to launch an effective general election campaign, and whether he can unite the party.

>> our party is united, but we are not for hillary clinton. the question is can folks put on a donald trump t-shirt and the reality is it is hard to do that given current rhetoric. >> reporter: leaving some to consider whether avenues exist for a trump alternative, unbinding delegates on the convention floor in july, an unlikely yet now discussed possibility. the talk is only expected to escalate in the coming days as top gop lawmakers and donors meet at a finance retreat organized by gop nominee mitt romney, a vocal trump critic. >> there's plenty of evidence that mr. trump is a con man, a fake. >> reporter: trump allies briefing supporters on capitol hill as the billionaire attempts to steady his campaign after a rocky last few days. >> trump is learning how to be a candidate. beat 16 pretty competent people and now is learning how to be a general election candidate. >> reporter: all this as republican donors long spurned

by trump in the primary are now voicing concerns, financial shortfall that will be according to one prominent donor in the hundreds of millions of dollars compared to hillary clinton's operation. trump moved to calm angite in new york, his team laying out an aggressive fund-raising and strategy all for the weeks ahead. and wolf, donor worries are only exacerbated by what's on the other side. the clinton finance campaign has been funded over decades, an organization on the ground for months and already raised $200 million, has more than $30 million in the bank. trump just over $2 million on hand. trump made clear he thinks he is playing by different rules. shortfall or not, his presence alone will help makeup gaps. paul manafort walking out of the meeting with donors put it

simply, we'll have enough to win. wolf? >> thanks very much, phil mattingly. let's get more on all this. joining us, the chairman of the hillary for america campaign, former white house chief of staff to bill clinton, john podesto. thanks for joining us. >> nice to be here, wolf. >> now that you have the endorsement from the president, how do you go about capturing the bernie sanders supporters, especially the young people? >> look, we're going to go out, try to campaign, earn their votes and earn their trust and welcome them into the campaign. bernie sanders ran an extraordinary campaign. starting next week we go on the road, talking about how to bring the country together, why it is stronger together, and secretary clinton will be joined by president obama next wednesday in wisconsin. that's part of the process of reaching out to people saying she's got the right ideas, the

values, the history to get the job done, to build an economy that's going to work for more people to be inclusive to give people the chance to live to god given potential. we have work to do, we are off to a good start, we are excited about the president's endorsement because he knows her so well and knows she can do the job. >> he was very enthusiastic in that video as we saw. sanders outside the white house after a one hour meeting with the president in the oval office said he would be competing in tuesday's washington, d.c. primary, he is not giving up yet. are you concerned that the longer he stays in the race, less inclined his supporters are to vote for hillary clinton in november? >> well, look, we have never tried to say he should stop campaigning, we respect his right to compete in district of columbia. he wants to make the case, and hillary joins him in that in

wanting d.c. to be a state of the union, but the fact is she's the presumptive nominee. she called him tuesday night, suggested they sit down, he agreed to that. as he said today he wants to talk to her about how we take the fight, beat donald trump, and how we build a more inclusive economy that's going to, you know, take on special interests and the economy. they agree on much of the agenda. i think it is time for them to get together and talk about how they can be partners in moving that forward and getting results for the american people. >> we are showing our viewers live pictures of a bernie sanders rally that's scheduled to get under way fairly soon in washington, d.c. you see some of the supporters, a lot of young people there. also seen a lot of anger and vitriol from some bernie sanders supporters, previously senator sanders said it was on clinton's

shoulders to unite the party. what is hillary clinton prepared to do to embrace bernie sanders as she moves toward the general election, specifically at the convention? >> well, you know, wolf specifically what she did is call him tuesday to congratulate him on a strong campaign, to suggest they sit down and see whether they can join forces. we have a lot to work out, the platform committee met yesterday and today. when you think about what they're both for, whether equal pay for women, more child care, affordable college, raising minimum wage, they're close together on the issues and compare that to the gulf that exists with donald trump, thinks pay is too high in america, wants to punish women for exercising reproductive rights, climate change is a hoax. i think they have a lot more in

common than they have division. obviously when you're a primary campaign, you accentuate the differences, but what they both want to see is an economy working for working people and i think when they sit down and talk that through we'll be able to figure out, have a great convention, bring the party together, and convince sanders supporters that might be skeptical that she's moving in a strong direction. she will get the job done as president of the united states and most importantly keep donald trump out of the oval office. >> i understand, i want to make sure that there are high level discussions going on between the bernie sanders campaign and your campaign. the hope from your side is to have a meeting. when is that going to take place, do you know, between senator sanders and hillary clinton? >> yeah, nothing has been scheduled yet but we're -- i think both sides want to be sure it happens and relatively soon. we are in discussions about that and really is a matter of

aligning their schedules. obviously they're both busy people. we're trying to get it done and get it done quick. >> following a meeting assuming it will happen soon, do you expect bernie sanders to do what president obama is about to do, go out on the campaign trail with hillary clinton? >> well, you know, i think we would welcome that. i think if you go back to 2008 after it became clear that senator obama won the pledge delegates, would be the nominee of the democratic party, that's exactly what hillary did. she went out even after that hard fought campaign, endorsed him, asked his name be put in the nomination by acclamation, she campaigned with him, separately, raised money for him. i think there's a lot to be, you know, this is a tough time, kind of been there. i know it's hard for senator sanders and his -- and jane and for his team, but we hope that

we can get his full support and that we will do everything we can again to team up the two extraordinary efforts to go and not just beat trump but move the country forward, get the job done that needs to be done for the american people so they can see their wages rise and ensure that everybody can lead a good life if they work hard and play by the rules. >> clearly you hope he follows the hillary play book, what she did for then senator barack obama eight years ago you hope he does for her this time around. john, stand by. we have more to discuss, including a new phase. there's a real twitter war under way between hillary clinton and donald trump. we will update viewers. much more after this. the call just came in. she's about to arrive. and with her, a flood of potential patients. a deluge of digital records. x-rays, mris. all on account...of penelope. but with the help of at&t, and a network that scales up and down

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we are back with john podesta. on twitter today, he said obama wants four more years of himself. and then she responded delete your account. then he responded how long did it take your staff of 823 people to think that up. is this campaign going to come down to a twitter war? >> delete your account is joke on twitter and i think we're

having some fun with him. but he's one guy who probably should take that advice, you know, he tries to take everything down, tear everybody down, run things into the ground and as she said, she's going to take him on but going to take him on on a plane in which she uses his own words as she did in san diego on national security, will continue to do that to show that he really just doesn't -- he's unfit for the office, doesn't have the character or temperament or the ability, depth, knowledge to lead the country. i think when people stop and think about donald trump in the oval office, the fact that his main skill is to dash off nasty tweets, they're going to think twice. that's why he is having trouble consolidating the republican party and people that took a deep gulp and endorsed him are now having second thoughts.

>> a source close to senator elizabeth warren of massachusetts confirmed to cnn she will endorse hillary clinton later today. we're standing by for that. the rnc, republican national committee weighed in with a statement. i will read it to you. by endorsing hillary clinton, elizabeth warren has shown herself to be a sellout, whether the wall street speech transcripts, refuses to release ties to the fossil fuel industry or coziness with big banks. hillary clinton represents everything elizabeth warren supposedly stands against. she wants this endorsement from elizabeth warren, but what's the reaction to this charge from the republican national committee? >> you know, first of all we very much are looking forward to support from senator warren. i am going to let her speak for herself. when you look at wall street

plans on the table as independent experts noted, hillary has the toughest plan. she particularly pledged to protect consumer finance protection board which is near and dear to senator warren's heart, she helped create that whole institution. when you look at these republican attack machine over and over again, they level false charges, if you look at where fossil fuel money lined up, it apparently is lined up behind donald trump, at least that's what it looked like when he was in north dakota saying that he would do anything to support them, whereas she pointed to the need to move to a clean energy future, they'll continue to, you know, attack us, throw out charges but we are going to run a campaign focused on moving the country forward, trying to bring the country together, arguing against division, hatred,

bigotry as we saw last week when donald trump attacked judge curiel. we are going to try to bring the country together, give a positive foundation for building an economy that's going to work for the american people, so we're used to it. they've been doing it a long time and i'm sure that's their play book. they'll continue to do it. what we need to do is to expose donald trump for who he really is which is basically a fraud and unfit to be in the office and to project what she wants to do for the american people. >> john podesta, thanks for joining us. >> thanks, wolf. tomorrow i sit down with the 2012 republican nominee mitt romney to discuss among other things his opposition to donald trump, his fund-raising efforts for the republican party. this is an exclusive interview. you won't want to miss it, tomorrow, 5:00 p.m. eastern here

in "the situation room." coming up, breaking news continuing. will major endorsements including president obama unify the democratic party. plus, growing unease among republicans over donald trump. there's a new effort under way to deny him the nomination. sir,m is growing at an alarming rate. growing fast, you say? we can't contain it any long... oh! you know, that reminds me of how geico's been the fastest-growing auto insurer for over 10 years straight. over ten years? mhm, geico's the company your friends and neighbors trust. and deservedly so. indeed. geico. expect great savings and a whole lot more.

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more on breaking news. president obama endorsing hillary clinton for president only hours after a private meeting in the oval office with bernie sanders of the announcement. coming in a video released by the hillary clinton campaign. watch this. >> for more than a year now across thousands of miles in all 50 states tens of millions of americans made their voices heard. today i just want to add mine. i want to congratulate hillary clinton on making history as the presumptive democratic nominee for president of the united states. look, i know how hard this job can be. that's why i know hillary will be so good at it. in fact, i don't think there's ever been someone so qualified to hold this office. she's got the courage, the compassion, and the heart to get the job done. and i say that as somebody who had to debate her more than 20 times. even after our own hard fought campaign in a testament to her

character she agreed to serve our country as secretary of state. from the decision we made in "the situation room" to get bin laden to our pursuit of diplomacy in capitals around the world, i have seen her toughness and her commitment to values up close. i see her determination to give every american a fair shot at opportunity, no matter how tough the fight was. that's what has always driven her and still does. so i want those of you that have been with me from the beginning of this incredible journey to be the first to know i'm with her, i am fired up and i cannot wait to get out there and campaign for hillary. >> that will happen starting wednesday in wisconsin. let's get more from cnn political reporter sara murray, joining us, senior political reporter manu raju, washington correspondent for new yorker, ryan lizza, and cnn legal analyst, jeffrey toobin.

guys, thank you very much. sara, secretary clinton has the support of the current president and the first lady as well, expected to get endorsement soon from vice president joe biden, senator elizabeth warren, her husband part of that all-star campaign group of surrogates, she's going to have a lot going on for her right now. how will they be used specifically by the campaign? >> that's absolutely right, wolf, it is a big contrast to what you see on the republican side, the fact that hillary clinton has a deep bench of experienced surrogates, willing to go out and hammer home her message. it sends a signal that the party is uniting behind the nominee. this is the opposite of what we see on the republican side, wolf, you see leaders of the republican party hold their noses and say they're going to endorse or vote for donald trump, and as of this week people are saying i don't know if i'm ever going to be able to get behind this guy. sets up a contrast between how parties are trying to come together or not so much after a

contentious primary. >> ryan, is this lineup equipped to fight this campaign by donald trump? >> i think that's a tough question to answer. so far no one has been able to figure out how to really go at trump. look, he defeated what was considered by republicans to be the 16 top republicans in the party, right, jeb bush, chris christie, scott walker, bobby jindal, these are the cream dela cream of the republican party and he dispatched of them with relative ease. i would have said no they don't know how to do this up until the speech she gave on foreign policy, figured out how to get under trump's skin and get all the trump lines with humor and seriousness and that was sort of a turning point in the campaign. obviously also came at the same point as his remarks with the

judge, but seems like they're fighting with sea legs. now one thing they need to do is unite the democratic party, make sure the sanders base of the party gets behind her. >> raises my next question to you. president obama, senator elizabeth warren are both hugely popular with bernie sanders supporters. how will their endorsement help secretary clinton unify the party? >> clearly they're going to be used to shore up her biggest vulnerability, younger, progressive voters, bernie sanders supporters, people that say they're bernie or bust, can barack obama or elizabeth warren fire up that base, we know that how much do endorsements really matter in this cycle? that's one spoof people are skeptical it will mean much, wolf. at the end of the day i agree with what sara said earlier. this is a contrast with the republican side. the key thing for surrogates is to create the echo chamber.

>> trump doesn't have people to do that. >> he doesn't. when you drill home one message from variety of people with a big megaphone, that can have effect. but trump, you know the last several days, what push back has there been against barack obama, coming out for hillary clinton or anything else, there's been nobody on the republican side amplifying that message. >> if anything, there's a unified surrogate like process of condemning trump, of republicans coordinating and saying wait a second, for the sake of the party, we all in unison must condemn those remarks. so that's very rare. >> jeffrey, president obama will be campaigning as pointed out next wednesday with secretary clinton in wisconsin. what type of role do you think he will be playing in the next month or so leading up to the democratic convention in philadelphia at the end of july? what role will the vice president, joe biden play? >> i think the roles have

changed over the last six months because the president has become a lot more popular than he was. he is now a lot more valuable in endorsement than he was six months ago. think about the difference in three recent presidents, ronald reagan, george w. bush and clinton. they were not succeeded by candidates of their own party. they were arguably repudiated by voters. barack obama wants to be like ronald reagan, he is at this moment about as popular as ronald reagan was in his presidency, just as reagan was a huge asset to george hw bush, it looks like he will be a real asset for hillary clinton across the country. stand by. we have more to discuss. getting word more top republicans are now saying they're not yet ready, won't be

able to support donald trump. much more right after this. you have cancer,

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anxiety over donald trump is roying the party. let's bring back the panel.

sara, john kasich said he could absolutely go to the convention and not endorse donald trump and saying it, and i am quoting now, why would i feel compelled to support someone whose positions i kind of fundamentally disagreed with. what are the options for republicans who feel that way? >> i think john kasich is in a bit of a more awkward position because he is the governor of ohio, the convention is in cleveland. donald trump has done outreach, he called john kasich before trump went after the judge, before he went after susana martinez, doesn't look like he has been able to patch things up. i think we have seen a number of republicans say they're going to skip this all together. i think we will see in the next couple weeks whether trump is willing to do this kind of outreach, the one on one phone calls, try to he is swaj concerns. for some people like john kasich, that's not going to be enough. >> jeffrey, house speaker paul ryan called trump's attacks on judge curiel distracting, said

he hopes trump can run a campaign people can be proud of. is this setting a bad example now? how do they get out of this? >> it's a hard problem. think about this. this has never happened in the modern era where you have the presumptive nominee of the party who is not supported by very significant part of that party. you have jeb bush, you have the previous nominee for president mitt romney who called him a con man who clearly is not going to support him. i think it is either going to be a disaster or we're going to be in such a new world where the party is essentially irrelevant to the candidate, but that's a tough sell when we do live in a two party system and one party usually is unified against the other. >> ryan, you reported a top republican senator isn't even

necessarily ruling out the possibility of voting for secretary clinton as opposed to donald trump. what can you tell us? >> yeah, susan collins of maine, long time moderate republican in an interview yesterday with me was talking about this awful choice that she has before her, talking about how trump's comments about judge curiel were order of magnitude worse than all of the other things that concerned her about trump. now interestingly she had never endorsed trump and still hasn't but she made the point, she pointed out she has a good working relationship with senator clinton, when clinton was in the senate and when clinton was secretary of state and she said it was unlikely but that she would not rule out the possibility of backing hillary clinton over donald trump. that's very unusual. even the most anti-trump, never trump folks, senator ben sass of nebraska or even mitt romney

during the primaries, they've said they could never, ever support hillary clinton, so susan collins is in a very different place, she's saying it is unlikely she would support clinton but will not rule it out. as far as i know, that's the only senior republican who is in that camp. >> that's fascinating. ryan doing good reporting for us. manu, among republicans that say they'll vote for donald trump, they're making a clear distinction they aren't ready to endorse him. they said they'll vote for him but won't endorse him. what does it mean for trump's general election campaign? >> means what jeffrey said earlier, a large segment of the republican party, particularly in washington, is not ready to get behind donald trump. i spent this we can talking to vulnerable senators in difficult races. some are okay, others not, kelly ayotte made the distinction she was vote for donald trump but is not ready to endorse him.

same with ron jon son, said the same thing. i will vote for him, not ready to endorse him. i don't know what the distinction is between that, but they're trying to say we're not endorsing and embracing all of donald trump's policies. i will say one other thing. ron johnson, during primary season he said donald trump would be good for him, said i would stump with him, like ronald and the donald stumping together. now he doesn't want to say i will endorse him. so a shift. >> it is worth pausing. i consider myself fluent in the english language, i know all the words. the difference between support, endorse, vote for, they're all the same as far as i can tell. the idea that politicians are drawing distinctions where -- you know, english means what english means.

>> i think jeffrey, i think the point they're trying to make is they'll vote for donald trump but you won't see them on the campaign trail actively campaigning for donald trump. that may be the distinction they're trying to suggest. guys, stand by. much more news after this. g hiln world sale is on honors members save up to 25% on brands like hampton, doubletree, hilton garden inn, and waldorf astoria so stop clicking around. book direct at hilton.com now that's satisfaction.

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♪ no, you're not ♪ yogonna watch it! ♪tch it! ♪ ♪ we can't let you download on the goooooo! ♪ ♪ you'll just have to miss it! ♪ yeah, you'll just have to miss it! ♪ ♪ we can't let you download... uh, no thanks. i have x1 from xfinity so... don't fall for directv. xfinity lets you download your shows from anywhere. i used to like that song. brazil is scrambling to prepare for the summer olympic games, but their serious concern, rio won't be ready in time. nick paton walsh is there. >> reporter: rio has a big question without an answer ready just yet. how do olympic tourists get from

their hotels here to the games across town? without spending hours in this, some of the worst traffic in south america. well, this was meant to be the answer. an extension to the subway from the beaches almost to the olympic park. but there's just one snag. they've just announced a new updated opening time. and that's only four days before the games begin. it's always going to be some sort of last-minute rush. but it's a sheer amount of political and economic upheaval that brazil is experiencing that's got many concerned that leaving such a vital part of the infrastructure as this down to last-minute preparations is simply cutting it too fine. it was meant to be open in july. and without it, guests may spend a lot of the day in jams. that's not going to happen, insists the government. >> we are completely sure that everything will be done. no problem for us.

of course, we have 8,000 people working during the days and during the nights. no problem at all. >> reporter: the sound of building is so loud, it's drowning you out. so we still have quite a bit more time to go, right, until this is ready. >> everything is in our schedule. >> reporter: they said the same thing about the olympic park itself. but when we visited when there were 66 days to go, it didn't feel that ready. it's strange to be able to walk straight in from there, right into the edge of the olympic park here. what's supposed to be a pretty secure zone in just a matter of weeks from now. and we're just going to walk down this way to the site of where previously there was one man holding out with his home. deeper and deeper, we went, security sitting by to find the home now demolished, the owner taking a payout and moving. an odd feeling, walking so

freely around. this worker told us sometimes security are there and sometimes they're not. living just alongside and ref e refusing to be moved, sandra and maria. they call themselves the resistance and they force authorities to accept they can stay on the land. sandra says she'll soon have all this packed away, ready for the new home the city is building her just next door. that's also on a tight schedule. supposed to be ready, she says, 12 days before the games begin. what does maria think about security? >> translator: it should be like that in every country. we were born to walk freely. i don't know why they came up with so much security. a man doesn't make another one safe. security comes from god. >> reporter: you have to hope they won't be leaving it just up to him, however, to get rio ready in time. nick peyton walsh, cnn, rio de

janeiro, brazil. another huge concern for the olympics, the zika virus, spread by mosquitoes and known to cause severe birth defects. some olympic athletes say they won't take part in the games because of the virus. let's dig deeper into this with the director of the national institute of allergy and infectious diseases, dr. anthony fauci. dr. fauci, thanks for joining us. first of all, is the u.s. government doing enough now to research and fight the zika virus? >> well, we certainly are. as you know, we have an issue of making sure that we get the proper funding to do it. but the nih and cdc are with money that we have taken from other funds, going ahead right now. and doing things such as mosquito vector control, which the cdc and their staff are very, very much involved with, and helping the individuals and the agencies in south america, the caribbean, particularly puerto rico. but brazil also. and we are in the process of

developing a vaccine, wolf, that we hope will get into the initial studies to determine if it's safe by hopefully, and i believe it will meet that landmark that we will be there in september of 2016 to get that at least started to determine if it's safe. and then we'll go into a much bigger efficacy study as we get into 2017. so we are really pushing the envelope, both from the cdc standpoint and from the nih standpoint. >> you have been the director over there at the infectious disease center since, what, 1984, a time when hiv/aids was just beginning to emerge in the united states. let me play a news reel clip from the cnn original series "t "the '80s" which documents the fight during that decade. listen to this. scientists at the national centers for disease control in atlanta today released the results of a study which shows that the lifestyle of some male

homosexuals has triggered an epidemic. >> bobbie campbell of san francisco and billy walker of new york, both suffer from a mysterious newly discovered disease which affects mostly homosexual men. >> our best guess is that it's somehow related to gay lifestyle. >> i was in the fast lane at one time in terms of the way i lived my life and now i'm not. >> reporter: researchers know of 413 people who have contracted the condition in the past year. one-third have died and none have been cured. >> tell us about the difficulties of identifying and fighting a disease that was so poorly understood at the time back in the '80s. >> that was an extraordinary time, wolf. i, as you know, got involved with that literally right from the very reports that came from the cdc in the summer of 1981 and it was very mysterious and very frightening. we were dealing with almost all

gay men who were desperately ill with an illness which we had no idea what the cause was. many of us from the beginning suspected this was a viral disease, but we did not know what it was, because it was a virus we had never seen before. and it really wreaked havoc mostly in the gay community with a lot of suffering and in the beginning there was a lot of inertia in getting things moving and calling attention to this. and there was just handfuls of us that were involved at the cdc, at the nih and some of the physicians in california, san francisco, l.a. and in new york. and then it became clear that this was something that was just the tip of the iceberg. and when the virus was recognized and we had a diagnostic test, it was stunning, wolf, how many people were already infected at the time that we knew that we were dealing with a new disease. >> really amazing. and i want to thank you on behalf of everyone for all the incredibly important work you have done over all of these decades. dr. fauci, thanks very much for

joining us. an important note to you're viewers, "the aids crisis" airs right here on cnn. you will want to see that. thanks very much for joining us. i'm wolf blitzer in "the situation room." erin burnett "outfront" starts right now. >> "outfront" next, breaking news. democrats out in full force, standing up for hillary clinton unleashing a barrage of attacks on donald trump. vice president biden, senator elizabeth warren, both live this hour. both going to fight. this is the gop is in disarray. more republicans slamming their presumptive nominee over remarks about a federal judge. can trump stop the bleeding? and campaign cash. top donors saying they won't give to trump. i'm going to talk to his top money man tonight. let's go "outfront." and good evening. i'm erin burnett. "outfront"