The N.A.A.C.P. has filed a lawsuit in federal court against former president Donald Trump and his lawyer, Rudy Giuliani. The suit, brought on behalf of Rep. Bennie Thompson (D-MS) claims the two violated a 19th century statute when they tried to prevent certification of the election on January 6th, according to the New York Times.

The lawsuit contends that Mr. Trump and Mr. Giuliani violated the Ku Klux Klan Act, an 1871 statute that includes protections against violent conspiracies that interfered with Congress’s constitutional duties; the suit also names the Proud Boys, the far-right nationalist group, and the Oath Keepers militia group. The legal action accuses Mr. Trump, Mr. Giuliani and the two groups of conspiring to incite a violent riot at the Capitol, with the goal of preventing Congress from certifying the election.

The suit contends that Mr. Thompson was forced to hide on the floor of the house gallery for three hours and wear a gas mask on January 6 while hearing “threats of physical violence against any member who attempted to proceed to approve the Electoral College ballot count.”

The suit also alleges Giuliani and Trump worked in collaboration with the Proud Boys and Oath Keepers far-right extremist groups. Mr. Thompson told the Times that he would have not brought the suit if the Senate had convicted Mr. Trump.

Politico spoke with the president of the N.A.A.C.P.:

“If we don’t put a check on the spread of domestic terrorism, it will consume this nation and transform it to something that none of us recognize,” NAACP President Derrick Johnson said in an interview. “We must, as a nation, prevent the spread of this type of boldness where [insurrectionists] will go to our U.S. Capitol and seek an act of treason.”