Democrats are rallying in a race to oust President Donald Trump as some of his fellow Republicans begin to confront him.
Liz Cheney, the third senior Republican in the House of Representatives, said she would vote for Mr. Trump as secretary-general in last week's U.S. Capitol riots.
The day before, the president had not taken any responsibility for the violation of Congress by his supporters.
He will replace Democrat Joe Biden on Jan. 20.
The House plans to hold a vote on Wednesday to accuse Mr. Trump of inciting a coup, which would make him the first U.S. president to be twice accused.
What did the Republicans say?
Mrs. Cheney, the daughter of former Vice President Dick Cheney, has vowed to bring back the epidemic, the first time a leader of the president's own party has done so since Richard Nixon took office. He said during a statement: "No President of the US has ever committed a greater betrayal of his office than the President and his oath to the Constitution."
The Wyoming correspondent added that Mr. Trump "called the gang, rallied the gang, ignited the flames of this attack."
John Katko and Adam Kinzinger, two other members of the Republican House, said they too would vote for impeachment.
House Republican leader Kevin McCarthy, an aide to Trump who has said he opposes impeachment, has decided not to vote for party rank and file members against the decision.
According to the New York Times, Senate Republican leader Mitch McConnell has told believers he wants Democrats to put pressure on the president because he believes it will help free Mr. Trump's Republican party.
Mr. McConnell also told the aide that he believed the president had committed the heinous crime, according to the Washington Post.
On Tuesday evening, Pennsylvania House Republican Brian Fitzpatrick raised a proposal to censor Mr. Trump - a less severe rebuke than a congressional impeachment.
The move alleges Mr. Trump tried to "illegally encourage" the results of the November presidential election and "imperiled a coequal branch of Government".