responsibility for violence at hitsdz his rallies. why he blames sanders and the threats he made against the campaign. the death toll rises from widespread flooding in the south. 5,000 homes damaged in louisiana alone. millions of people under threat. new revelations about the co-pilot who crashed a passenger plane. who is allowed in the cockpit. residents claiming new health concerns after they were told it was safe to move back home, was the all clear given too soon? "nightly news" begins now. this is "nightly news" with kate snow. reporting tonight from miami, florida. good evening. with two days until voters here

images this weekend were distressing. i think a -- anger boiling their and new signs that the republican party is fracturing. he was accused of creating an atmosphere that condones violence, but trump insisted again he wasn't to blame. instead, pointing to protesters who support democratic senator bernie sanders for raises the temperature. and the key question now, what impact will the tension have on tuesday's vote? we begin with gabe gutierrez. >> reporter: no arrests at the donald trump donald trump rallies. get them out. get them out. now. this after secret service surrounded him hours after a chicago rally was cancelled amid violent clashes. on wednesday, a trump supporter punched a man. >> i don't accept responsibility. >> trump came to his defense.

you know what? not nice on the other side either. >> it's possible you could help him with legal fees if this man needs it? >> i instructed my people to look to it, yes. >> reporter: a man was kicked out today, saying he thinks that trump is inciting the violence. >> i get passionate about the whole racism and hate that is being shown at these rallies. >> reporter: marco rubio saying he's very concerned someone could lose their life at a trump event. he's in florida. make or break home state. grasping for votes as the new nbc news/"wall street journal"/marist poll has him behind trump. >> he's turned the most important election into a circus, a carnival. >> reporter: john kasich faring better in ohio but even if he wins his home state, he can't secure the nomination without a contested convention.

the world see images of americans clocking each other at the campaign rally they're like, we're in disarray. that's what they'll try to say. it will be used as a propaganda tool. >> reporter: and ted cruz is looking for a prolonged fight against trump. >> responsibility starts at the top. it is not beneficial when you have a presidential candidate like donald trump telling the supporters, punch that guy in the face. >> reporter: tonight the front-runner is refusing to pull any punches on the way to the nomination. trump is set to speak in boca raton, florida, later tonight. to give you an idea of how confident he is, his campaign florida tomorrow, choosing to visit ohio instead. kate? >> gabe guan tianlangtierrez, thank you. trump is casting blame on

bernie sanders who in response has flatout called trump a liar. meanwhile, hillary clinton's latest attack has backfired a bit. we get more on all of that from nbc's kristen welker. >> reporter: donald trump calling for the arrest of violent protesters at his rally. now saying democrats are orchestrating them. laying blame directly at senator bernie sanders. >> they had bernie sanders signs all over the place. they were made by bernie sanders people. >> reporter: sanders dismissing trump's claim. >> we have never never once called anybody to do anything like that. the truth is, this guy really is a path logical liar. >> reporter: trump threatening retaliation, tweeting bernie sanders is lying when he says his disrupters aren't told to go to my events. be careful, bernie, or my supporters will go to yours. while some sanders' supporters denied getting violent. it's the other way around.

threats since the trump rally. it came with the territory. these are the type of people that i support -- that are supporting donald trump. >> reporter: this comes as the democrats are locked in a tight race. our latest poll shows clinton with commanding double digit leads in florida and ohio, but topping him only by six points in his home state. she accused sanders of being absent during the health care debate. >> i don't know where he was when i was trying to get health care in '93, '94. >> reporter: prompting a sanders aide to post this video from 1993, showing sanders standing behind the then first lady during one of her health care speeches. >> i'm grateful that congressman sanders would join us today. >> reporter: the clinton team insisting the video proves their point, that clinton was leading the fight. but sanders isn't backing down. >> to criticize me on health care is not quite fair because i

in the fight for universal health care. >> reporter: the heated back and forth underscoring the high stakes on tuesday if sanders wins big in the midwest like here in ohio he'll get more momentum and more money and could go all the way to the convention. kate? >> kristen welker, thank you. as we have mentioned here in florida, donald trump is leading our latest nbc news/"wall street journal"/marist poll by more than 20 points over home state marco rubio. trump supporters call themselves the silent majority. while it may not be as conventional as other so called ground calls, trump has an army of volunteers in the state. we met one crew in hollywood, florida. linda? how long have you been sitting out here? >> i have been out here since last saturday every day, 8:30 to 6:00. >> reporter: what do you hear

>> no, voters are going into the polling, they're giving me a thumbs up. trump is the man. we need him to make america great. we need to change our country for the better. they're going in to vote for trump. >> reporter: you saw the video friday night in chicago. >> yes, i did. >> reporter: people think that trump supporters are angry. some of the own republican competitors are saying he's instigating. getting people riled up. >> are americansngry, yes, i'm angry, i'm angry at my current system. our current government has failed the american people. donald trump has brought that to the forefront. >> get them out of here. >> reporter: so he says things like i want to punch that guy in the face you feel what? that's a human reaction.

conversation with donald j. trump i would say how do we deal with these thugs and that's all they are. thugs. >> reporter: are you meeting new voters? >> i'm meeting new voters all the time. in fact, we met a cuban man who voted for first time. did you vote for donald trump? he said absolutely. >> reporter: you don't see large call centers for trump, but people are being trained to make phone calls right out of their open home. are you planning to vote for mr. trump in the republican primary? rachel, how many phone calls have you made for donald trump? >> 10,352. >> have you been calling all day long? >> sometimes for 11 or 12 hours. >> why are you so passion natural about donald trump? >> he's a brilliant business man. he loves the country. he is the epitome of the american dream. he's totally -- he's taking a

to rebuild the american empire. >> reporter: rachel said she's an entrepreneur who works from when own home. part of the army here, she considers trump a mentor. now to the devastation in the south where millions remain under threat of flash floods across four states. the death toll has now risen to six from the record breaking storms and tonight the region is on high alert for possible tornados. we get more from nbc's sarah dalla. >> reporter: relentless rain through the days. >> it's incredible. >> reporter: and tonight the threat of more rain on already saturated grounds. >> it's been pretty bad. hopefully won't get worse. but it doesn't look good. >> reporter: 2 million people in parts of four states are under

families fleeing as the sabine river overflows. right now we're in the sabine river. people are evacuating. the only way out is by helicopter or boat. buildings. gone. in louisiana. more than 800 in louisiana. come back up given, what went through your mind? >> oh, no, not again. escaped by boat. returning to a basement filled with water. >> we'll survive, you know? we have people that will help us and everything. >> reporter: the city spared from the path of the storm. but the officials warn the floodwaters could be toxic. >> if you look at all the trash and floating through the house, the house, you know, there's

>> reporter: officials are urging residents to continue to drop. this after a sixth weather related death. to retrieve personal belongs from his house. kate, back to you. >> thank you so much. turning overseas where a car bomb has killed more than two dozen people in the turkish capital of ankara. chief foreign correspondent istanbul. richard? >> reporter: good evening, kate. by all accounts this was a powerful cash bomb that exploded in the center of ankara at a transportation hub. a place that there are multiple bus stops, several entrances to the subway. most of the people killed and the dozens and the death toll has been updated. we are waiting to get on one of the buses, walking around in this area. no claim of responsibility, but

americans that there could be a terrorist attack a few blocks from where this explosion took place today. it's unclear if that warning in the u.s. embassy was connected to the attack. there's been a lot of bombings in ankara and also a shooting not very long again in istanbul. with the terrorist attacks people when they hear there's been another one are not -- are not surprised and shocked that it happened. but asking themselves well, who was responsible this time? and there are two likely groups. the kurdish militants who have been fighting against the government primarily in southern and eastern turkey. or isis which has been using turkey as its main transit point into syria for the last several years. so far the turkish government hasn't made any specific accusations. kate?

in ivory coast armed men at least 14 civilians, two soldiers according to the president. the gunman targ -- targeted beachgoers and at least six attackers were also killed. the north african branch of al responsibility. days before the anniversary of the germaniman wings crash that killed all 150 people on board a commercial jet investigators have released their final report now. it claims the co-pilot who intentionally crashed the plane had raised red flags about his mental health. but the airline was never told. now as nbc's kelly cobiella reports there's a push to change patient confidentiality rules if it means keeping passengers safe. >> reporter: just two weeks before flying into the french alps killing everyone on board, french investigators say co-pilot andreas lubitz was

psychiatric hospital. >> on the day of the crash, lubitz was on two antidepressants and sleeping pills. his employer was never told. nearly a year after the crash, the final report confirmed lubitz purposely brought the plane down. 30 minutes into the delightflight, the pilot leaves to use the bathroom, and he is locked out, changing the altitude to 100 feet and increasing the speed. the captain pounds on the door. passengers scream for four minutes. then, sounds of five violent blows to the cockpit door. 41 minutes after takeoff, the jet crashes into the side of the mountain at 400 miles an hour. the parents of passenger robert oliver calvo hoped it would

>> almost everybody completely unsatisfied with the answers that were given. >> reporter: investigators said lubitz hid his condition from employers and doctors didn't talk about it citing patient confidentiality. there's a requirement now to doctors to speak out if a mental health of the pilot threatens public safety and requiring pilots to have more mental health checks. tonight, germanwings parent company lufthansa will support the recommendations and the airline denies wrongdoing. a criminal investigation can take years. kelly cobiella, london. massive gas leak drove them

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is. >> reporter: one letter says move now that's a rheumatologist, telling you to leave. >> absolutely. telling us to leave. >> reporter: melissa moved back this week, but she said her rashes began when a ruptured well spewed methane gas into the atmosphere. the los angeles county health department immediately started to receive 700 complaint, headaches nausea and rashes. fears turned to anger. >> please do something. >> reporter: the well finally capped and sealed last month. thousands returning home told it was safe, but now the health department is reporting 300 new health complaints in the last several weeks. despite capping the well, matt paduco says his own home still makes him sick. >> one of the sickest days was the night

and i spent a night here. >> reporter: next week well owners southern california gas will test a small number of homes to see if the me tape that -- methane lingers. >> we want to do the tests to ease the concerns and fears of the residents. >> reporter: little comfort for melissa, concerned the marks on her skin are signs of something worse. >> i worry about what happens in the next ten years or what happens when i have kids. is this something they have to deal with? >> reporter: worry that will linger until the residents get answers. steve patter i think we should've taken a left at the river. tarzan know where tarzan go! tarzan does not know where tarzan go. hey, excuse me, do you know where the waterfall is? waterfall? no, me tarzan, king of jungle. why don't you want to just ask somebody?

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finally tonight, we escaped to an amazing world of adventure where our minds can go even when our bodies can't. some of the hottest technologies, transporting kids to some places they'd never see otherwise and that includes time travel. our kristen dahlgren shows us how it works. >> come on, honey. >> reporter: for a little guy like brody scott, being in a hospital is tough. but in an instant, all that changes. hospital walls, virtually disappear. and breauxody is flying free on a roller coaster. how fast were you going? transforms and he never leaves his bed. >> you think is about having fun. thanks to virtual reality. every week volunteers from tech company game start bring vr technology to the children's hospital at

michigan. in a wheelchair, kids who can't move any part of their body can fly an airplane or just walk. >> reporter: put on a headset and the pain seems to disappear. even for the sickest gerald clooney is battling cancer but today he gets to be >> upside down. >> what? >> it's a little moment in time where they're just -- in just a blink our kids got to be normal. >> reporter: kids once confined to beds now can't stop moving. even medicine is a lot ease year to swallow. the hope is that all hospitals can bring this type of joy to patients who often have little to cheer about. >> without that technology, without the people that help bring this stuff to this hospital, how many kids are going to pass away without knowing the experience and the thrill of the

>> reporter: thrills most. >> oh, my. >> reporter: and for a little while at least reality seems a whole lot brighter. kristen dahlgren, nbc news, ann arbor, michigan.

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how many friends you got? more than...10. so the other nine is haters. [ laughter ] whoo-hoo, oh, good, good, good you won't believe what these kids can do, and you probably won't believe what they gonna say. where are your balls? okay. [ laughter ] and i'm feeling great right now this is not a competition. we gonna have a great time tonight. she is gonna hypnotize some animals. that's it. bop, bop, bop. that's it. whoo-hoo, good, good, good this guy's only four years old, and he's already a genius on the piano. [ playing mozart's "rondo alla turca" ] [ cheers and applause ]