To visit hiroshima since the United States dropped the first atomic bomb there in 1945. Here are part of his remarks before his historic visit to hiroshima. This afternoon, i will visit hiroshima. This is an opportunity to honor the memory of all who were lost during world war ii. Its a chance to reaffirm our commitment to pursuing the peace and security of a war where Nuclear Weapons would no longer be necessary. Nbcs ron allen is traveling with the president and has a preview from japan. Reporter a place so heart breaking no u. S. President has dared visit hiroshima. A long b29 was over hiroshima. Reporter obliterated by an atomic bomb 71 years ago and more than a hundred thousand killed. The Mushroom Cloud rising the vast devastation. President obama will honor the lives lost but not secondguess nor apologize for president trumans decision to drop the bomb. Every leader makes very difficult decisions, particularly during war time. Reporter a survivor, ito, now 73, wishes an american president had come sooner top to hear his nightmarish memories and his body blasted into the air and buried under the rubble and his mother and sister were killed. I want the president to see the true horror of an atomic bomb, he says. Harry trumans nephew grandpa always said publicly and privately that he made that decision to end the war quickly and save american lives. Reporter mr. Obamas address is supposed to be brief and subdued and not a big elaborate event. His goal without Nuclear Weapons remains far from achieved. Japan. In the United States donald trump is now officially the republican nominee for president. After racking up new unbound delegates in north dakota, colorado and pennsylvania, armed with his partys delegates, trump unleashed attacks on Hillary Clinton while laying out his general election pitch in an interview speech yesterday. It is word of a debate between trump and Bernie Sander that is making news. Nbcs Hallie Jackson has more. Boy, oh, boy. Reporter his president ial bid making history donald trump is ready to make more. Id love to debate bernie. He is a dream. Reporter the businessman hoping to make a deal with democrat Bernie Sanders for an unprecedented oneonone debate if they can raise 10 million for Womens Health charities. Online fundraisers already popping up. Sanders eager to do it in the biggest stadium possible. Its important that somebody hold him to task outrageously bigoted remarks. Reporter it would be the first of its kind in modern political history. A presumptive nominee up against the other partys unlikely candidate. Its in trumps interest to keep sander relevant. There are no political risks to donald trump in debating Bernie Sanders because trump has never really delivered a stellar debate performance yet his poll numbers always seem to tick up a little bit. Reporter trump opening the door to debate senator Elizabeth Warren who once identified herself as part native american. Trumps nickname for her, pocahontas, had this exchange. Who . Pocahont pocahontas . Very offensive im sorry about that. Pocahont pocahontas, is that what you said . Elizabeth warren . Reporter yet another controversial moment for from his muslim ban and as president obama overseas takes trump to task. They are not sure how seriously to take some of his pronouncements, but they are rattled by it. The president s comments came as a global poll made up of citizens from france, germany, the uk, canada and mexican, and japan say trumps views are having a bad impact for the global economy. 74 say trumps politics have had a negative effect on their view of america and a whopping 78 say trumps political views make the world less safe. Jumping off those poll numbers. Hillary clinton is now slamming trump as, quote, an urgent threat. Speaking to msnbc, she cast doubt on whether a trump sanders debate will really happen. I know they have gone back and forth on this. They seem to be, you know, saying its some kind of joke. Trump serious. But clinton remains in damaged control after that scathing Inspector General report accuse her of breaking email policies. Andrea mitchell has those details. Reporter a firestorm over Hillary Clintons email server growing, clinton downplaying the Inspector Generals report and clinton saying what she did was allowed. The use of personal email was a practice by other secretaries of state. Reporter the report says clinton did break the rules, not preserving her emails, not asking for permission to exclusively use a private server, which would have been refused. The difference here is nobody else had a private server in the basement of their home. Reporter as for her emails saying she didnt want the personal being accessible, clinton phoning in to chuck todd. What were you worried about with the personal being accessible . Accessible by who . Nobody wants their personal emails made public. You know, that is, i think, a very common, if not unanimous feeling among people. Reporter but its another investigation that will be far more important to clinton. The ongoing fbi investigation reportedly at issue was there any mishandling of classified information on her home server . The fbi confiscated the private server and a thumb drive with emails last august. Clintons close aides cheryl mills and huma abedin have been interviewed by the fbi. All of these revelations are fodder for donald trump. Probably illegal. Have to find out what the fbi says about it but certainly bad judgment. Reporter clinton trying to get the focus back on donald trump. Donald trump is an urgent threat to our rights and to our country. What she needs to do, more than anything, to try to fix her problem on the question of honesty and trust worthiness is get this whole thing behind her. We have a t. I. E. At the Scripps National spelling bee. 11 yered jang amp are the champions. Nihar is the youngest winner on record. Jairam misspelled two winners but he tied. This is the Third Straight year cochamps have been crowned. Zika fears are on the rise as the summer draws closer but the battle over zika funding continues to stall in congress. Minutes after congress began talks to merge two zeke a funding bills both of which falls short of president obamas 1. 9 billion dollar request, cdc director tom frieden had this to say about the delay. Imagine that youre standing by and you see someone drowning and you have the ability to stop them from drowning, but you cant. Now or a hundred thousands. Thats what it feels like to know how to change the course of an epidemic and not be able to do it for any reason. Frightening words there. Nearly 600 cases of zika reported in the u. S. Over 270 are pregnant women who are at risk of having babies born with birth defects. A superbug long feared by medical professionals have been found in the United States. Doctors confirmed that a strain of e. Coli with a woman with urinary tract infections, even the last antibiotic of last resort is no help. The first superbug was found seven months ago in pigs and spread to a small number of people in china and traveled to africa, europe, canada and now to the United States. The cdc is investigating how the woman who do not travel outside the u. S. May have contracted the bacteria. Extreme weather continues to pummel much of the this monster tornado touched down in bryan, texas. Look at that thing. More than two dozen homes were damaged by. In woodlands, texas, one brave driver got caught what looks more like a lake than a highway. That driver was luckier than these folks whose cars wound up stuck and stranded. Nbc meteorologist bill karins is here. Usually they say if you cant see the bottom of it, dont drive through it. Get out. That is what is happening tonight. There have been a lot of water rescues taking place in texas. People have been getting their vehicles stranded and people going to observe the flash flooding going on down just to the south of college station. This is an area of great concern. A flash flood emergency for this region. They have gotten a ton of rain the last 12 hours and another band, slow moving thunderstorms moving over the same exact areas where the crews are out there doing water rescues already. We have had a crazy amount of rainfall in this area. This is houston area here. That hasnt been too bad but north of houston, this area of between 10 to 16 inches of rain. That is 15 inches of rainfall our doppler estimates and large area and this is where the water is everywhere. Imagine a foot of rainfall in about 12 hours. That is why we have flash flood emergencies for this entire region here and flash flood warnings from austin to houston at this time as we continue to watch the slow moving area of storms and lifethreatening weather. As far as Severe Weather goes today and tornado, wont be as much today as the last coupled but from oklahoma to north texas and scattered strong storms from st. Louis up to chicago today. The east coast is still very warm but continuing id rather be hot than dealing with the dangerous weather we have had in the middle of the nation. That is your national weather. Here is a closer look at your day ahead. The thunderstorm threat will end this morning and then we will reload and get another round of storms later on this afternoon. We will also see some of those storms pushing into the ohio valley. Its going to be warm and a little more sticky. Humidity on the increase a little bit in the northeast. So we will continue to update you on the situation in texas. Lives taken from the flash flooding but its going to be bad once the sun comes up. Hopefully, we dont hear any of that happening. Thank you, bill. Scary moments for travelers as their plane engine catches fire. Plus the best beaches in america to hit this memorial day weekend. We will show you where they are next here on early today. Rly e a golf ball. I drive to the hoop. I drive a racecar. I have a driver. His name is carl. But thats not what we all have in common. We talked to our doctors about treatment with xarelto®. Xarelto® is proven to treat and help reduce the risk of dvt and pe blood clots. Xarelto® is also proven to reduce the risk of stroke in people with afib, not caused by a heart valve problem. For people with afib currently well managed on warfarin, there is limited information on how xarelto® and warfarin compare in reducing the risk of stroke. You know, taking warfarin, i had to deal with that blood testing routine. I couldnt have a healthy salad whenever i wanted. I found another way. Yeah, treatment with xarelto®. Hey, safety first. Like all blood thinners, dont stop taking xarelto® without talking to your doctor, as this may increase your risk of a blood clot or stroke. While taking, you may bruise more easily and it may take longer for bleeding to stop. Xarelto® may increase your risk of bleeding if you take certain medicines. Xarelto® can cause serious and in rare cases, fatal bleeding. Get help right away for unexpected bleeding, unusual bruising, or tingling. If you have had spinal anesthesia while on xarelto®, watch for back pain or any nerve or muscle related signs or symptoms. Do not take xarelto® if you have an artificial heart valve or abnormal bleeding. Tell your doctor before all planned medical or dental procedures. Before starting xarelto®, tell your doctor about any kidney, liver, or bleeding problems. Xarelto® is the number one prescribed blood thinner in its class. Well that calls for a round of kevin nealons. Make mine an arnold palmer. Same here. With xarelto® there is no regular blood monitoring and no known dietary restrictions. Treatment with xarelto® was the right move for us. Ask your doctor about xarelto®. My man friend that ive been syour man friend. Like, as i was leaving i was like, goodbye, i love you, and like. laughs whatd he say . I said, dont say anything oh god laughs cause now like, this is the cliffhanger, so we dont know if he loves you. Choose to shine. Revlon colorstay gel envy with diamond top coat. Our toughest top coat yet features exclusive diamondflex technology for chipresistant wear and multifaceted shine. Colorstay gel envy diamond top coat. Only from revlon. Early this morning in japan, a terrifying sight. Smoke billowed from the engine of a korean air jet. All passengers and crew quickly evacuated. Firefighters doused the jet with foam. Luckily, no injuries were reported and investigators are looking into the cause of that engine fire. In kentucky, a tour group ran into a cave as floodwaters rose yesterday. The 19 College Students and four tour guides entered the hidden river indicative cave. When the flash flood pushed in they were pushed back to the attic which has a ceiling. After several hours were finally make their way out to first responder. It seems no atm is safe. In virginia, Surveillance Video caught a thief smashing his way into a campground store. He whacks away at the machine before pulling it out to a dolly and loading it on to a van. Police are still searching for the wellprepared crook. Time to get down to business now. Thousands all over america will be hitting the beach this memorial day weekend. Do you know where americas best beaches are . According to coastal expert dr. Beach, here is this years list. Number three is a beach in maui, hawaii. Its perfect for snorkeling. Number two is fiesta beach in sarasota, florida. The finest sand in the world 37 the top spot to huma bay in oahu, hawaii. Doesnt it look gorgeous at the pump with you dont expect it to last. Crude oil prices popped over 50 dollars a daryl yesterday for the for the first time this year. Ahead, the warriors face elimination. The stanley cup final matchup is set. Sports is next. Can a toothpaste do everything well . This clean was like pow it added this other level of clean to it. It just kinda like. Wiped everything clean. 6x cleaning my teeth are glowing. They are so white. 6x whitening i actually really like the 2 steps. Step 1, cleans step 2, whitens. Every time i use this together, it felt like. Leaving the dentist office. Crest hd. 6x cleaning, 6x whitening i would switch to crest hd over what i was using before. After trying brookside chocolate, people talk about it online. Love at first taste. I would liquefy it and bathe in it. Curse you, brookside your nefarious plans have succeeded. Nefarious . Are we still talking about chocolate . Brookside. Talk about delicious. New aquafina sparkling. 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It is the penguins first trip back to the finals since 2009. They face the san jose sharks. Game one is monday at 8 00 p. M. Right here on nbc. And for the shot of the day, we head to the pga, the dean deluca invitational from colonial country club. Kevin chappell right on the money he dunkses it for the eagle. Dont we all wish it was that easy . Just ahead, Justin Bieber hit with another lawsuit . Plus a fundraiser of epic proportions. Find out how much was raised at nbcs annual red nose day special. Youre watching early today. O its time to get seriously silly, people. Join red nose day to do some serious good to help fight kids poverty. Its simple just get your red nose, only at walgreens, and get your silly on, seriously. Time is running out. Get your red nose today at walgreens. Snack patrol, saving the snack world. Whoa, whoa, whoa. Maam, we can smell the bland snack all over you. But, its just a. Whoa, whoa, whoa, whoa, whoa, whoa. Yeah. Yeah. 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Many celebrities stopped by to help out. The event raised money for organizations to lift children out of poverty. And by the end of the night, the grand total had reached over 30 million donations are still being accepted at red nose day. Org. Well, singer white hunterland says it does and is suing Justin Bieber over it. She says bieber stole samples of her song for his single hit sorry. Officials have not commented on the matter. Khloe kardashian has filed for divorce over lamar odom. The couple married in 2009. Coming to theaters this weekend is apocalypse. And they will face off with alice through the Looking Glass starring johnny depp. Stephen spielberg gave a College Graduation speech yesterday. You will determine the actual future and i hope its filled with justice finally, i wish you all a true hollywood style happy ending. I hope you outrun the trex, catch the criminal, and for your parents sake,