A frantic fight on the front lines to stop it. Nightly news begins right now. Announcer the Democratic National convention. This is nbc nightly news with lester holt reporting tonight from philadelphia. Good evening. Their partys chairman off the program, an apparent russian email hack and now a revolt among Bernie Sanders supporters. There was chaos on the floor below us this afternoon. Just minutes after the opening session was gavelled to order, sanders supporters began screaming his name, disrupting the program and shattering any illusions of party unity. Party chair Debbie Wasserman schultz off the speakers platform. Andr Andrea Mitchell starts our coverage. Reporter tonight the Convention Theme is united together. But theres signs thats not happening. A stunning scene, combative party chair, debby Wasserman Schultz, booed by Bernie Sanders supporters. And you will see me every day between now and november 8 on the campaign trail. Reporter whats happening here this morning is a big group of why Campaign Officials do not want debby Wasserman Schultz appearing at the convention. Finally escorted off the stage and outside by security. I think she needs to go. Reporter the issue emails were leaked by wikileaks, reporting that clinton did have dnc support over sanders. Saying she would resign after the convention, Wasserman Schultz hoped she would have her time in the spot light tonight. Leaving the boston mayor to gavel the convention to order. Across town, hundreds of sanders fans out in force, despite sweltering heat, but when sanders called for party unity, supporters not ready to follow. We have got to elect Hillary Clinton and tim kaine. This is the real world that we live in. Reporter tonight the dnc apologizing to sanders for the inexcusable remarks made over email. But they couldnt even get through the opening prayer without an interruption. Nominating Hillary Rodham clinton as our candidate. Reporter and during speeches, more protests, holding up signs. Bernie sanders ignited a revolution, his followers arent ready to give it up. Hes ready to back Hillary Clinton, the question is can we bring his supporters along for the ride. Reporter sanders tweeted, i ask you to not engage on any kind of protest on the floor. She just got fired. They said debby, youre fired. Get out, debby, out, boom. Reporter and tonight, debby Wasserman Schultz has been spotted here at the convention, a big test will be in delegations here in vermont, speakerslike michele obama, Elizabeth Warren and Bernie Sanders can portray a different Hillary Clinton has been the one that Bernie Sanders has the republicans have been describing for the last year. The blame for that dnc hack expose by wikileaks is being placed at Vladimir Pugh fti putins doorstep. The Clinton Campaign saying that theyre trying to help trump in the election. But Julian Assange responds to those allegations. Reporter the thousands of hacked emails leaked to wikileaks rocked the Democratic National committee. But who stole them . We asked wikileaks founder, Julian Assange, holed up in the u. S. Embassy in london. The dnc emails were hacked by russian intelligence, what do you say . Theres no proof of that whatsoever, we have not disclosed our source, and of course this is a diversion. Reporter several american Cyber Security experts told nbc russias goal in leaking the emails through wikileaks was to sew chaos into politics and help donald trump win the presidency. They are trying to give trump an indirect edge or indirect way they can help him accomplish his goals. Reporter russias leader Vladimir Putin clearly has a motive to help donald trump. Actually putin did call me a general you. The alliance designed to halt russian expansionism. Trump isnt buying any of this. She worked very, very hard to rig the system. Little did she know that china, russia, one of our many, many friends, came in and hacked the hell out of us. Reporter cyber experts say the dnc was hacked by the cyber units of both Russian Military intelligence and the new kgb, nicknamed fancy bear and cozy bear, th. Russia denies involvement. This is the heart of the dnc, which is now turning the convention upside down. Reporter one cyber secu Bernie Sanders speaks tonight, can they afford to hear more boos here . Theres going to be democrats in there glee watching what happened during the Republican Convention not feeling that way today. You have Bernie Sanders protesters and it seems to not matter what Bernie Sanders himself says right now. He addressed the crowd before the convention and he himself was booed. So it seems like the sanders team and the clinton team are singing from the same sheet of music, they want party unity, but it seems like the people inside this hall have a different idea. Your take . Im old enough to remember when the republicans had a party unity problem. I think it was just a week ago. I think there are real concern in both camps that sanders has lost control of his own supporters, it means his speech is even more important tonight. How do the sanders smatterings of boos on the inside. Did he wait too long to endorse . This festering problem with the dnc, the fact that it took the email hack to get it out there, sanders supporters thought for months that debby Wasserman Schultz was not playing fair. I think the clinton camp knows they made a mistake waiting. In hindsight, they should have acted two months ago and they might be in a better place today. Ill see you both for our prime time coverage, 10 eastern, 7 00 pacific. Terrible news about another mass shooting in america, two teens are dead. A dozen more injured after gun fire erupted in ft. Myers. The youngest victim is 12. Automatic gun fire in club blu. 30, 40 shots, shootout. Reporter it was around 12 30 in the morning when this florida nightclub teen party had just let out. This woman said she saw a gunman with a semiautomatic weapon spraying bullets in the parking lot as parents arrived to pick up their children. When the gunfire stopped, 17 wounded, the youngest just 12 years old. Within minutes the young victims and witnesses took to social media. I cant believe it. I was just trying to protect my sister. Reporter this attack comes just six weeks after 49 people were gunned down at an orlando nightclub, just a few hours away. Police have confirmed this was not an act of terror. We have three persons of interest in custody. Not going to go into who they are. And were still looking for others. Shaun only 14 years old, did not survive. Stephanie white lost her 14yearold soften, a Rising High School basketball star. My heart is heavy. His classmates at a loss tonight. He helped me through so much. He helped me become a better player on the court, he helped me become a better person off the court. Reporter there is a Prayer Service going on behind me, three victims are still in the hospital tonight, two in critical, one in fair. As far as motive, police are still not willing to discuss a possible motive. Lester . Theres late word this evening of a deadly stabbing rampage west of tokyo, reports say a man with a knife killed at least 15 people at a center for the disabled where police remain on the scene. Dozens of others are said to be injured. The suspect has reportedly turned himself in to authorities. The motive is unclear. Here at home, we turn to the unrelented heat that covers most of the country. Dozens of cities are approaching the 100degree mark today, temperatures 5 to 12 degrees above normal with 15 Million People under heat advisories. Reporter its extreme heat that has much of the east coast in a vice grip this week, from the national mall. To the convention in philly, a humid and miserable 97, in new york, spot Power Outages have left a few thousand without ac. Theres no air, theres no hot water, its kind of inconvenient. Reporter across the country dozens of cities are pushing the century mark, even hotter with humidity. This persistent dome of heat continues to cause problems with heat indexes especially in the m midatlantic steaates. D. C. Subway drivers warned to slow down worried the heat could damage the rails. Reporter its right now 140 degrees on the black top, and inside this car thats been locked up, 134 degrees. Reporter in dallas, a 2yearold boy was the 2 1st person to die of heat stroke. Whos at risk is the young and the elderly and also keep in mind anybody on medication like antibiotics, that can also play a role. Reporter meanwhile the extreme heat is powering up the thunderstorms. Lightning blew up this telephone pole, with more expected along the east coast tonight. With the heat index, we hit 112 here in washington and were expecting 0s today. And those intention sto intense storms firing up along the east coast. Still ahead this evening, into the inferno, thousands evacuated as extraordinary images captured the speed of destruction from exploding wildfires, the race to stop the flames before they torch even more its the Little Things in life that make me smile. Spending the day with my niece. I dont use super poligrip for hold, because my dentures fit well. Before those little pieces would get in between my dentures and my gum and it was uncomfortable. Even well fitting dentures let in food particles. Just a few dabs of super poligrip free is clinically proven to seal out more food particles so youre more comfortable and confident while you eat. So its not about keeping my dentures in, its about keeping the food particles out. Try super poligrip free. Man, my feet same time tomorrow, fellas . 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Reporter in a massive firefight, homes are being saved, while others are being left in charred ruins. 3,000 firefighters are now trying to stop an enormous enormous inferno, with evacuations now facing 3,000 people. The winds catch the flames and picked up by 30 to 340 miles an hour. Reporter today in the fire zone, thats exactly what we saw. In a span of five minutes, you see this ridge is on fire, its burning on both sides of the road right now, firefighters are also falling back because these flames are becoming way too intense. When the winds flare up and cause a fire storm, this is all the fire crews can do. But around homes, hundreds of fire engines are protecting structures. So far at least 18 houses have been lost, including several belonging to firefighters. Their children were just happy their fathers were okay. Just wanted to make sure that they could see their daddies again. Reporter across california over a dozen fires are burning, one near big sur has torched 20 homes and burned 15,000 acres, up and down the state, people have lost everything they own. It feels like its alive and has a mind of its own. Reporter Officials Say this fire is growing at a rate of about 10,000 acres a day and even with all of the resources they have thrown at this fire, its likely going to be friday before they have it under control. Some remarkable images there, gaddy, thank you. Were back in a thank you. Were back in a momentr lower back pain sufferers, the search for relief often leads. Here. Here. Or here. Today, theres a new option. Introducing drugfree aleve direct therapy. A tens device with high intensity power that uses technology once only available in doctors offices. Its wireless remote lets you control the intensity. And helps you get back to things like. This. This. Or this. And back to being yourself. Introducing new aleve direct therapy. 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Reporter as the democratic partys biggest names prepare to step on stage, hers is unfamiliar, but her message is no les power. Can you believe this is your moment to address the company . Silva is a dreamer, one of nearly 1. 5 million undocumented immigrants brought to the u. S. As children. She arrived when she was just 4. There really means theres hope that we can live without fear. Reporter to her shock, president obama first brought her story to life in 2014 including a young woman named astrid silva. Reporter silva was overwhelmed by the moment as the president spoke of her grandmothers passing in mexico. She couldnt travel to her grandmothers funeral without fear of being deported. Reporter it sort of strikes me that you are living the american dream, the only thing missing is that youre an american. What is being an american mean . Theres so many people that have come to this country and have become citizens and theyre american, so what is it . This country has always been about opportunity. Reporter what is your question to donald trump . These are families, these arent statistics. These are families that have lived here for decades. Reporter now silva is a recent college graduate. After years in the shadows, tonight stepping in the spotlight. Peter alexander, nbc news, philadelphia. That is going to do it for us for now on this monday night, im lester holt, i will see you tonight at 10 00 p. M. Eastern, 7 00 pacific for prime time coverage of the Democratic National convention. For all of us at nbc news, thanks for watching and good night from philadelphia. A city full of history will now witness another historic moment. We are all standing understand a Glass Ceiling right now. This week Hillary Clinton becomes the democrats first female nominee for president. Are we ready to go win an election in november . She has her former opponent on board, but can she win over his supporters . And could another email scandal divide this party even more . Its all going to unfold right here in philadelphia. And nbc10 has your allaccess pass