the new test for one of the deadliest forms of cancer. nbc news investigates a town in oklahoma divided >> you are a leader in an oklahoma chapter of the white nationalist organization, and i want to know if you have any explanation to that. >> the city official at the center of a firestorm. and ringing in spring, the phone hotline that will lead you to the most beautiful sights of the season >> announcer: this is "nbc nightly news" with lester holt good evening, and welcome. the end of tiktok, as we know it in the united states, may be closer tonight after the house of representatives passed a bill that could impose a ban on the hugely popular video-sharing app in the u.s. concerns over tiktok's chinese parent company and a potential national security risk carried the day in the house. the bill approved on a 352-65 vote with one democrat voting present. in all, 50 democrats and 15 republicans voted against the bill, which now heads to the senate. tiktok, which denies its service as a spy tool, claims 7 million small businesses and 170 million american users, and in a statement urges the senate to consider the facts, listen to their constituents, and realize the impact on the economy. republican house speaker mike johnson applauding the vote in a statement saying, it signals our resolve to deter our enemies. nbc's savannah sellers has details. >> reporter: the bill needed two-thirds of the house to pass, and it got that easily >> the yeas are 352. the nays are 65. >> reporter: now, it goes to the senate where it will likely face a tougher road. if signed into law, it would give chinese parent company, bytedance, just six months to divest tiktok or face the possibility of a ban on the app the legislation prompted by national security concerns including fears the chinese government could access americans' personal data and feed them content that would influence their views. >> our intention is for tiktok to continue to operate, but not under the control of the chinese communist party. >> reporter: the 50 democrats and 15 republicans voted no. >> it's an overly broad bill that i don't think would stand first amendment scrutiny. >> it's opening pandora's box, and i'm opposed to this bill. >> reporter: aligning with former president trump, who once tried to ban tiktok, but now says he's against that tiktok fighting back hard, even flying creators to washington >> hello, this is my son. >> reporter: jason linton shares his life as a dad with his 13 million followers. >> what would it mean for you and your family if tiktok were to be banned in the u.s. >> it would be devastating. being able to just launch out a positive message would be completely stopped >> i wish it was a bad dream, but it's not. ♪ >> reporter: j.t. laybourne uses tiktok to promote his clothing company >> do you think this should impact how people vote? >> 100%, there will be people that will not be re-elected because of the way they choose to vote on this ban. >> reporter: tiktok says it has 17 million users in the u.s. according to an nbc news poll. 22% of voters say they use the app once a day or more. the potential political fallout with those young voters not lost on some senators. >> cutting out a large group of young voters is not the best-known strategy for re-election. >> reporter: republican mike gallagher, one of the bill's sponsors, says that's not a good enough reason to ignore a looming national security threat >> i don't think courting the clicks of 17-year-olds should take precedence over allowing our foremost foreign adversary to dominate what is increasingly becoming the primary news source for americans under the age of 30. >> reporter: tiktok says its ceo was on the hill today, but it's unclear if he met with lawmakers the company maintains it is not owned or controlled by the chinese government >> this legislation if signed into la will lead to a ban of tiktok in the united states >> savannah, what's the thinking of how this bill might fare in the senate? >> reporter: its future is uncertain. majority leader chuck schumer has been noncommittal about bringing it up for a vote meanwhile, the leaders of the senate intelligence committee released a statement praising the bill and calling for senate action. president biden has said that if it passes, he will sign it, lester >> savannah sellers at the capitol tonight, thank you. so, just what is the potential threat to national security that many say tiktok poses, and how could your data potentially be used? senior washington correspondent hallie jackson reports. >> reporter: it's not the trends that worry top u.s. officials, but the threats, they say, tiktok poses sounding the alarm about the popular app's chinese-based ownership. >> tiktok presents serious national security risks to the people of the united states >> americans need to ask themselves whether they want to give the chinese government the ability to control access to their data. >> reporter: like many apps, tiktok collects user information like ip addresses, approximate location, synced contacts, and more the concern, not only that china, the ccp, might be able to see all that info, but how they could use it, especially in an election year. >> you cannot rule out that the ccp could again use tiktok as a platform to influence 2024 elections, right? >> we cannot rule out that the ccp could use it, correct. >> reporter: now, fears the chinese government could covertly spread mis and disinformation, all of it part of a broader battle with one of the biggeste of the biggest world economic powerhouses. >> i think this is one of the rungs on the way up the ladder of a cold war-type dispute between the united states and china there's so many more opportunities for the chinese to influence the american population >> reporter: tiktok's already banned on government-owned devices in the u.s. and in countries like canada and australia india banned the app altogether tiktok has long insisted it works to protect personal info pointing out new u.s. user data is stored on a u.s.-based cloud, and it denies china's government controls the app. >> the bottom line is this, american data stored on american soil by an american company overseen by american personnel >> reporter: in a letter to congress, tiktok says, it's invested more than $1.5 billion to address concerns and argues u.s. data could be less secure if the company is sold. lester >> hallie, thank you. also tonight, what could be the biggest snowstorm in years about to hit denver, and severe weather headed for parts of the midwest. bill karins joins us. he's tracking it all. >> lester, this crippling snowstorm will be all day tomorrow, but we're already starting out with some really strong thunderstorms we have two severe thunderstorm watches, one for the st. louis area, one in central areas of kansas and we may get another one over kansas city these will be blossoming going all night long as far as the risk area goes, kansas city to st. joseph is in the enhanced risk, and tomorrow we have a chance of severe storms from dallas to just south of chicago, so isolated tornadoes too. as far as the snow goes, we have about 6 to 5 million people in these watches and warnings the hardest hit areas, from denver into the foothills. someone will get three to four feet of heavy, wet, crippling snow and power outages for the denver area, at least a foot with this big storm. >> all right, bill, thank you. tonight the head of the ntsb says investigators are still missing critical information from boeing about that max 9 door plug that blew out over portland. tom costello covers aviation for us. tom, the ntsb chief is clearly frustrated >> she is. jennifer homendy says boeing has still not provided important details that ntsb investigators need about why that door plug blew out and why four bolts were missing that hold it in place in a letter to congress, homendy writes, to date we still do not know who performed the work to open, reinstall, and close the door plug on the accident aircraft. boeing has informed us that they are unable to find the records documenting this work. investigators asked for security footage from the factory floor back in the fall, however, she writes, they were informed the footage was overwritten. boeing insists it has cooperated fully, and it has security videos that are kept for just 30 days on average, lester >> all right, tom costello, thank you. let's turn to the deepening crisis now in haiti the u.s. sending in a new contingent of marines to guard the embassy, and americans making some harrowing escapes, including a best-selling author. gabe gutierrez reports from neighboring dominican republic >> reporter: tonight, with haiti in utter chaos, a new team of u.s. marines has been sent to help protect the american embassy this is what hell on earth sounds like, a nighttime gun battle in port-au-prince captured on a terrified bystander's cell phone another woman, this haitian american, says an armed gang kicked her out of her home and threatened to kill her if she went back >> we are so frightened for our lives, we can't never go back home >> reporter: she's now desperately trying to escape and meet up with her family in miami, but the border and the airports are shut down. also suddenly trapped, best-selling author mitch albom visiting an orphanage his charity runs in haiti. >> you can't go anywhere you know, you can't get out. that's how haitians live every single day. >> reporter: then a harrowing escape, a stealth private helicopter mission rescued albom and orphanage staffers. >> you know, the fear mission rescued him is that the gangs are going to shoot at helicopters, and they've done that. we were all on top of one another, just a big ball of humanity, and the door closed, and within 60 seconds, we were up in the air in the dark and flying. >> reporter: haiti's prime minister just said he'd step down as soon as a new interim government took over, but a notorious gang leader known as barbecue is calling for civil war. here in the neighboring dominican republic, the government is stopping desperate haitians from coming, and in florida, the governor is already deploying extra law enforcement and drones in anticipation of a possible migrant influx from haiti, lester. >> gabe gutierrez, thank you. and back home now, it is official the biden/trump rematch is set after both candidates clinched their nominations tuesday, and mr. trump today getting some good legal news in georgia. peter alexander has late details >> reporter: tonight, the showdown is set, the rematch polls say most americans were hoping wouldn't happen between president biden and former president trump. late today the president here in battleground wisconsin. >> my predecessor, who failed the most basic duty any president owes to the american people, the duty to care. >> reporter: the latest polls show the race in wisconsin is tight. >> how many bagels do you guys make in a day? >> on the weekdays we're doing 800, 900. >> reporter: at allie boy's bagelry in milwaukee, owners ben nerenhausen and staci lopez tell us their costs are rising, but they resisted raising prices >> we're playing with what consumers are willing to pay versus what we have to pay. >> reporter: these democrats are anxious about the economy, but it's social issues like abortion rights solidifying their support for the president. >> we're almost turning the clock backwards. it is very frightening. >> reporter: overnight mr. trump taking aim at the president >> there's never been anybody worse at doing that job than joe biden. >> reporter: matt owns an auto repair shop in waukesha county telling us more customers are coming in because it's cheaper to fix an older car than to buy a new one. >> these guys should be buying a new car, but these days -- >> right, you can't afford it. you got a family and you got a house and mortgage. >> reporter: he supports mr. trump saying america is worse off than it was four years ago. >> i want my economy back i want our national security back. i want our tax money to stay here. >> reporter: meanwhile, a georgia judge today dismissed six charges in the election interference case involving mr. trump saying, they were too vague including a charge related to this phone call where the former president pressured georgia's secretary of state. >> i just want to find 11,780 votes, which is one more than we have. >> the judge left the door open for prosecutors to refile those charges. mr. trump has pleaded not guilty president biden heads to campaign events in michigan tomorrow while former president trump will be in a florida courtroom in his classified documents case, lester. >> peter alexander, thank you. in 60 seconds, screening for colon cancer, the new blood test that could be a game changer right after this game changer right after this. ffect the lungs and lower airways. but i'm protected with arexvy. arexvy is a vaccine used to prevent lower respiratory disease from rsv in people 60 years and older. rsv can be serious for those over 60, including those with asthma, diabetes, copd, and certain other conditions. but i'm protected. arexvy is proven to be over 82% effective in preventing lower respiratory disease from rsv and over 94% effective in those with these health conditions. arexvy does not protect everyone and is not for those with severe allergic reactions to its ingredients. those with weakened immune systems may have a lower response to the vaccine. the most common side effects are injection site pain, fatigue, muscle pain, headache, and joint pain. i chose arexvy. rsv? make it arexvy. we're back with a ne we're back with a new way to test for colon cancer, the second-leading cause of cancer deaths among american adults. anne thompson is here with more on a promising study. anne >> it really is, lester colon cancer can be treatable if it's caught early, but more than 40% of adults 45 and older don't follow screening guidelines, often deterred by colonoscopies or at home stool tests now, a large, new study in "the new england journal of medicine" reports a blood test was able to detect 83% of colorectal tumors. while colonoscopy is still the most accurate screening, this new test is designed for people with average risk of colon cancer and no family history the test is already available, but since it's not approved by the fda yet, it is not covered by insurance and costs about $900 the testmaker, guardant health, tells us the fda will be approving or will be considering approving the test later this year >> and i know you'll be following it. anne, thanks very much. coming up, a town that put a man who ran a white nationalist group on the city council. how some are now trying to vote him out. our investigation is next our investigation is next. hy they choose t-mobile for business. pga of america and t-mobile are partnering on 5g-powered analytics to help improve player performance. 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[ crowd chanting "jews will not replace us" ] >> reporter: this is judd blevins in 2017, tiki torch in hand in charlottesville, virginia, marching alongside avowed white supremacists and neo-nazis. >> i saw the picture of judd blevins with the tiki torch, and i was, like, just shocked. >> reporter: the more they looked, the more they found blevins had been an active leader in the white nationalist group, identity europa according to an analysis of photos, biographical details, and other information, blevins hid his white nationalis identity behind the online moniker conway. in private online forums reviewed by nbc news, blevins as conway posted racist messages and praised hitler, and yet when the former marine ran for city commissioner last year as a conservative republican -- >> he won by 36 votes. [ crowd chanting ] >> let's go. >> reporter: now presnall and vickers are part of the enid social justice committee, vocal opponents of blevins since he took office. the group mincing no words on its website saying, enid has a nazi problem. >> a lot of people don't want to say the word nazi, but when you see what he did and what he's involved with, you know, it's not name-calling it's what he is and what he believes. >> reporter: we wanted to ask blevins what he believes for ourselves, but he denied our multiple requests for interviews we tried once more outside a city council meeting. >> can i ask, you are a leader in an oklahoma chapter of a white nationalist organization, and i want to know if you have any explanation of that. >> come here come here. come here. >> no. >> then why did you hold a tiki torch and march? why did you says jews will not replace us? >> i've been a conservative all my life. >> reporter: cindy allen was editor and publisher of "the enid news and eagle" when blevins won, and her paper had published a front page story about his past prior to the election blevins called it a hit piece. >> we followed up many times, and he never would answer us. >> and yet he won. >> he won. there's an opportunity now to address what kind of tolerance of extremism this community is going to have >> reporter: enid's mayor, david mason, also a conservative republican says, behind closed doors, blevins admitted to his involvement in white nationalist activities >> and my follow-up question was, are you still involved with those groups and he told me, i do not have to answer that question, and my thought was, you just did. >> reporter: blevins' opponent in the recall election set for april 2nd is a republican too. she didn't want to talk about the race with us, a race that most here see is squarely about blevins. >> if we vote him in a second time, that probably says a lot about -- about who we are. >> reporter: that identity is exactly what vickers and presnall are working for. national white supremacist organizations have called you two outrageous antifa commandos. >> badge of honor. >> what happens if you don't win? >> we keep putting up a fight. >> we're not going to put up with it quietly. >> reporter: fighting, they say, for the soul of their city. brandy zadrozny, nbc news, enid, oklahoma and we'll take a break, but there's more ahead next, a callback to a simpler time. the hotline to spring. where to find the best wildflowers. to a simpler time. the hotline to spring. where to find the best wildflowers. ♪ ("good feeling" by flo rida feat. atr) ♪ this is a hot flash. 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