And flash floods. More than 80 million at risk. Major disruptions to air travel. More than 6,000 Flights Canceled or delayed. Ground stops in atlanta, baltimore, philadelphia, washington and new york. In d. C. Federal offices closing early. Danger on the roads. A charter bus crashing in pennsylvania. At least three killed. Were tracking the storms. Also tonight, the deadly midair tragedy. Two firefighting Helicopters Colliding in california. What were learning. Donald trump firing back after federal prosecutors ask for a protective order to limit what he can share about the 2020 election probe. Why his attorneys say the judge should reject it. Our nbc news exclusive on the Campaign Trail with ron desantis. After years of avoiding questions about it, desantis now taking direct aim at Donald Trumps false claims about the 2020 election. What he told us. The alleged plot to assassinate ukraines president zelenskyy foiled. The woman in custody tonight. Our nbc news investigation. The potent
videos of the incident and that more could be coming. it s something that shouldn t have happened and it s something that we re investigating right now. reporter: the chaos unfolded saturday night after witnesses say a worker asked a group multiple times to move their pontoon so a commercial riverboat could dock. krista owens says she films this video from on boat the riverboat. they re mad this guy who came off our boat is untying his boat and touching it. but it needed to move. reporter: a brawl starts, and within seconds several people appear to join in. witnessing our poor crewman being attacked by these guys. and we couldn t do anything about it. yeah, these white folks reporter:r: after the riveverboat docks s fifighting eruptpts again. polilice on the ground struggling to contain the chaos. but eventually getting some in handcuffs. the mayor now placing the blame on several reckless individuals for attacking a man who was doing his job and vowing that justice wil