and we beginin with several dropping stories at this hour. first,ew claims that some of donald trump's personal information has now been hacked. the trump campaign responding at this hour. there is also new backlash tonight after donald trump's warning that there could be riots at the republican convention, if the party stands between him and the nomination, if there's a contested convention. tonight, house speaker paul ryan slamming the comments, calling them, quote, unacceptable. all of this comes after the images we've seen from trump rallies, protesters and pporters clashing. abc's chief white house correspondndt jonathan karl on the backlash and on the claims that trump has now been hacked. >> reporter: donald trump w w denounced today by republican leaders in washington and ohio for predicting riots if he loses the nomination this summer at the convention in believe land. >> i think you'd have riots. i think you'd have riots. i'm representing a trendous, many, many millions of people. i think you would have problems like you've never seen before.

would happen. i really do. i believe that. i wouldn't lead it, but i think bad things would happen. >> reporter: unacceptable, said speakeof the house paul ryan. >> nobody should say such things, in my opinion, because, to even address or hint to violence is unacceptable. >> reporter: and ohio governor john kasich, who is both running against trump and hosting this summer's convention, told abc news trump's caulktalk is dangerous. >> to even imply that there could be violence if he doesn't get his way, you know, he's not running for the presidency of the wwe, he's running for president of the united states. and this kind of language is an outrage. >> reporter: and today, trump is under fire from an entirely different source. vladimir putin. the kremlin today the denouncing trump's latest attack on hillary clinton. this video, it spliss together footage of clinton and the russian president. putin's spokesman today accused

it comes one day after trump said this, when asked who he consults on foreign policy. >> i'm speaking witit myself, number one, because i have a veve good brain and i've said a lot of things. >> reporter: hillary clinton claiai she's already getting worried calls from foreign leaders. >> i'm having foreign leaders ask if they can endorse me to stop donald trump. i said, you know, i mean, this is up to americans, thank you very much. >> reporter: and tonight, another attack on trump. the hacker group anonymous claims they have hacked into his private information, including his social security number, cell phone information and address. >> and zwloon karljonathan karl live with us tonight. the trump campaign is responding to possibly being hacked? >> reporter: the trump campaign has just released a statement, saying, quote, the government and law enforcement ahorities are seeking the arrest of the people responsible for attempting to illegally hack mr. trump's accounts and television information. david? >> jonathan karl leading us off tonight.

now, to the democratic side tonight, and to a report today in "the new york times" that president obama met with donors and suggested it might be time for bernie sanders' campaign to wind down, and for the party t t unite behind hillary clinton. but today, the white house said, not so fast, clarifying what the president did say. abc's cecilia vega on the campaign tonight. >> reporter: tonight, is a possible turning point c cing in the race? "the new york times" reporting esident obama told a group of democratic donors it will soon be time foror bernie sanders' campaign to end, and for democrats to unite behind hillary clinton. today, the white house denying the president was endorsing clinton, but adding, he did say this. >> our success in november, in electing a democratic president will depend on the commitment and ability o o the democratic party to come together behind our nominee. >> reporter: if that's hillary

for two people w once battled. >> although we weren't able to shatter that highest, hardest glass ceiling this time, thanks to you, it's got about 18 million cracks in it. >> reporter: but then, that meeting at the white house. clinton joining his team, that moment in the situation room, and now clinton on the trail, campaigning on their close ties, helping herself, buthelping his legacy, too. >> i think he doesn't get the credit he deserves for having fought for a recovery that is taking hold. >> and cecilia vega with us tonight. it would seem the president has been very careful so far, not endorsing eher one of these candidates, but he's offered praise before for his one-time rival. >> reporter: he has. he's called her one of his most trusted advisers. and he seems to be choosing words very carefuy right now. but this seems to be as close to an endorsement as you can get. >> cecilia, thank you. in other news this evening, to the grilling on capitol hill

crisis in flint, michigan. and a new list being reported tonight by "usa today," as they looked into lead in the water in more than 40 states. governor rick synder grilled by congress today. some calling for him to resign. our cameras right there with the head of the epa, under fire for allegedly not moving quickly enough, after learning of the dangers. "usa today" went backk four years, reporting about 350 water systems across america, failing tests, some of them, dozens of times. abc's mary bruce tonight with the camera rolling, getting answers s ain. >> you need to take some responsibility because you screwed up. >> reporter: tonight, the blame game erupting on capitol hilil >> what does accountability look like for you? >> reporter: democrating laying into michigan governor rick synder over the water crisis in flint. >> you were completely missing in action. that's not leadership. do you think? >> i was not missing in action, congressman. >> reporter: the governorr acknowledging mistakes.

questions, i should havav done more. >> reporter: but for many, that's not enough. >> and there y are, dripping with guilt, but drawing your paycheck. >> reporter: i asked the governor about calls for them resign. governor synder, will you resign? no answer, but synder not the only one under fire. >> do i think the system failed? yes. >> reporter: republicans blaming epa administrator for being slow to act. >> i'm not trying to shift respsibility. >> yes, you have. >> reporter: afterwards? who is to ame? >> who is to blame for what? >> reporter: who is the blame for the crisis in flint? >> well, the system failed. >> reporler: still no clear answer. >> get out the way. >> reporter: and it's not just flyn a "usa today" investigation finds problematic levels in the water in schools and day care centers in 42 states. one school in maine with lead levels 41 timesigher than the epa limit. >> those were eye-opening numbers today.

there, including from you. but you spoke with some of the families from flint who traveled to d.c. heard today? >> reporter: david, the families we spoke with said that someone has to be held accountable. but what they want more is simply a solution to this david? >> mary bruce with us live from capitol hill tonight. mary, thank you. now, to breaking developments, newmages coming in at this hour, after the capture of a young american, reportedly from virginia, accused now of fighting for isis. we reported earlier this week on the 26-year-old captured, taken into custody by kurdish forces. tonight, a new video here, explaining why he left the u.s. and adding that he, quote, made a babadecision. abc's chief foreign correspondent terry moran with the new video. >> reporter: accused by kurdish auauorities of fighting for isis, the young american, born in virginia, tells a very different story. it was all about a girl, he told

with the girl, to go to mosul. cause i wasn't thinking straight. >> where are you infrom? >> united states. >>. >> reporter: mohammed jamal kw khweis, 26ears old, captured monday by kurd ishish peshmerga fighters near sinjar, iraq. he says he left the u.s. last december and made his way through europe to syria, and then to mosul in iraq. but he hated it there. >> it's not like the western countries. you know, it's very strict, there's no smokingand i found it hard for everyone there. >> reporter: and he k has a message. >> my messe to the american people is that the life in mosul is really, really bad. the people who control mosul don't represent the religion, isis, isil, they don't represent the religion. >> reporter: u.s. officials say upwards of 250 americans have traveled to the middle east to join extremist groups. khweis says that's not him, but

questions from u.s. investigators about what exactly he was doing in isis territory. david? >> all right, our chief foreign correspondent terry moran tonight. terry, thank you, as as. and to another headline toght involving the fight against isis. secretary of state john kerry day accusing isis of committing genocide against christians and other muslim grgroups in iraq and syria. the terror group blamed for thousands of deaths, many forced to convert to islam or be killed. today's announcement is not expected, though, to change america's military strategy against isis. back in this country now, and we move on to dangerous storms across parts of this country tonight. severe thunderstorms damaging homes and business in the dallas area tonight. hail pounding away at drivers on the highway. that is from arlington. golfball-sized hails from texas all the way to florida, and of course, meteorologist rob marciano tracking it all for us. hey, rob. >> reporter: that's going to be the main threat tonight is hail. we've had reports of tornadoes, one in southern mississippi. this is the threat zone. this may be extended into the

several ways of convection, really, the next couple of days along the stalled front. the last wave saturday is what we've got our eye on for the northeast. going to make a run. mostly rain across the east coast during the day on saturday. watch the freezing line drop down to the coastline. several i ihes of snow from d.c., the big cities, new york into boston. could sese 6 to 12 inches, heavy wet snow, especially inland from i-95. this could be significant for the first day of spring. >> winter is not letting go. rob, thank you. >to north korea now, and the battle to win t t freedom of a young american college student. the 21-year-old breaking down in tears during court on wednesday. we showed you the pictures then, sentenced to 15 years of hard labor for attempting to steal a political poster from the hotel. you can see him in the video right there. abc's chief global affairs correspondent martha raddatz tonight w wh the new effort under way to get him released and returned home. >> reporter: tonight, the u.s. is quietly working to free american student otto warmbier. it was this security video that

warmbier stealing a political banner like this one from the hotel where he was staying with a tour group. and taking it is a crime against the state. >> i have made the worst mistake of my life. reporter: the 21-year old uva student clearly shaken, now sentenced to 15 years of hard labor. >> please save my life. please think of my family. i am the oldest son in my family. >> reporter: now helping the family seek release, former governor bill richardson, he equates the theft with a college prank. >> hopefully now after this sentencing, it'll mean negotiations can start on his release on humanitarian grounds. >> reporter: close to a dozen american tourists have been arrested in north koa in the last six years, all released. the north cree yaps skoreans have, in the past, wanted a high-level negotiator, like bill clinton, who helped free two young

tension with the north koreans because of their nuclear and ballistic missile tests, and there is no telling what they will do and what they will demand. david? >> martha raddatz with us tonight. martha, thank you. we turn now to president obama, and his history visit to cueba cuba. "world news tonight" beenwill be back in havana, starting sunday night. the president machling one of the first direct letters to cuba in decades, sent to a cuban woman who has written him in the past, thanking him. she has invited the president, hoping he has time for coffee. by the way, the last president to make this trip, calvin coolidge in 1928, with the first lady back then. and we should mention tonight that we will have an exclusive interview with president obama, during his historic visit to cuba, monday, in havana, on "world news tonight." in the meantime, there is "world news tonight." the stunt gone wrong. take a look.

students injured when the flames suddenly get o of control. more from the scene coming up. also, the sea change at sea world. the popular attraction revealing a majojonew decision tonight. and right here this evening, the robin roberts exclusive. one-on-one with prince harry. as he reveals to robin the moment he felt broken. (vo) if you have type 2 diabetes, you may know what it's like to deal with high... and low blood d gar. januvia (sitagliptin) is a once-daily pill that, along with diet and exercise, helps lower blood sugar. januvia works when your blood sugar is high and works less when your blood sugar is low, because it works by enhancing your body's own ability to lower blood sugar. plus januvia, by itself,s not likely to cause weight gain or low blood sugar (hypoglycemia). januvia should not be used in patients with type 1 diabetes or diabetic ketoacidosis. tell your doctor if you have a history of pancreatitis. serious side effects can happen, including pancreatitis which may be severe and lead to death.

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they will no longer b bed orcas in captivity. abc's ryan smith tonight on the outrage that's been mounting, and why the decision was made now. >> reporter: the acrobatic whales were sea world's signature attracacon. but tonight, sea world's ceo, bowing to public pressure, announcing all of its orca shows will be coming to an end by 2019 and they will no longer breed killer whales in captivity. >> current orcas will be the last generation at sea world. >> reporter: sea world swimming in critism for the last several years, following the release of the 2013 documentary "bla fish" and the death of dawn brancheau, killed by tillikum. supporting the 51-year-old company, one of its loudest critics, the humane society. >> we were enemies in a lot of ways. but we have a mutual friend that pulled us together. >> reporter: so, it's a win-win. >> i believe it is. >> reporter: both, hoping this first step helps protect one of

>> this is something that every animaled a coe vat in the nation can celebrate as progress. >> reporter: sea world tells us they're replacing the orca shows with more natural whale experiences, and the 29 whales there now will stay there for their own safety. david? >> ryan, thank you. when we com back here tonight, a pair of recalls this evening effects not one but two popular brands of tuna fish. also, the concern with e-cigarette e-cigarettes. a new case on a flight, a delta flight, as we have details coming up. and the fire breather at a high school pep rally. the incredible images. the moment the stunt goes wrong, and the injuries, right after the breck. i've heard it all. eat more fiber. flax seeds. yogurt. get moving. keep moving. i know! try laxatives. been there, done that. my chronic constipation keeps coming back. i know. tell me something i don't know. vo: linzess works differently from laxatives.

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professional stunt artists, their act caught on camera as the performance g gs wrong. a fire breather wielding a baton. the fire growing out of control. the stunt artist hospitalized for burns, in serious condition at a hospital tonight. seven students take on the the hospital after complaining of respiratory issues. other 20 treated on the scene. a major change coming to cars in this country. automakers will include automatic braking systems as standard features within the next several years. the car would brake for you if it senses a crash coming. car makers hope the new camera and sensor technology could cut rear end crashes 40% and save thousands of lives. to an alarming moment on board a passenger plane. a delta flight from atlanta the st. louis delayed after an e-cigarette in a passenger carryon ignited. the use of e-cigarettes on u.s. flights banned already this

month. and to a pair of ref calls tonight involving two popular tuna fh brands. butible bee brands recalling 32,000 cases of tuna due to underprocessed products that could cause serious illness. chicken of the sea brand tuna recalled, as well. the concern there,e, possibly undercooked products. no illnesses reported so far. when we come back on a thursday night, what you could call, well, a royal exclusive. prince harry, revealing to ourur robin roberts the moment he felt broken at his mimiion. i take pictures of sunrises. it's my job and it's also my passssn. but with my back pain i couldn't sleep... so i couldn't get up in time. then i found aleve pm.

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finally, we have reported so often on our wounded warriors behind him. and there's a certain prince who has made that his sole mission. prince harry telling our robin clear to him. >> reporter: when prince harry was called back from afghanistan, after his deployment was revealed, he found his new mission. >> there was an element of me thinking, i'm an officer, i'm leaving my soldiers. i was broken. and suddenly i find myself on n plane, while i'm sitting there, i look through the curtain in the front and there's three of our lads, wrapped up in plastic, missing lilis. that's how it all starteded for me, is, like, these peoeoe are role models. and they need to be celebrated re among society. >> reporter: celebrated, like former aircraftman mike goody, who lost his left leg in a ied attack, then suffered

what does it mean to have prince harry here, encouraging you all every step of the way? >> prince harry has been absolutely legend. we couldn't get@ rid of him if we tried. he was pumping everything, gettg everything going, really encouraging, drumming up support. >> anybody who serves our country and puts their life on the line and then can bring themselves back from an injury like that desees everything from every single one of us. >> robin roberts with prince harry. espn will cover the invictus games in orlando in early may, and much more with prince harry tomorrow on "gma." i'm david muir. i'll s the bigger the burrito, the bigger the fun. dunkin's new grandde burrito -- a breakfast bubuito packed with big southwest flavor. go grande with veggigior sausage today.

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[ applause ] it's st. patrick's day, i think. yes, it is. thank you, jim. thanks, everybody. and thank you for being you. hello. good to see you all. let's go. get those thumbs limbered up as we give away $1,000 in our first "toss up" of the night. "proper name" is the category. now it's up to you, vanna. [ bell chimes ] shanna. martha washington. that's it. [ applplse ] in honor of st. patrick's day, guess. shanna flora, right? shanna: yes. ...is from alvin, texas. stay-at-home mom. who do you stay at home with? i stay at home with my three kids, levi, jace, and linen. married to a cowboy. yes, sir. in the audience. live on a cattle ranch? i do, yes. what officially makes someone a cowboy? i mean, you know what i mean? it's more than just a hat, right? oh, yes, it's a lot more than that.