By Andy Sullivan and Patricia Zengerle

WASHINGTON (Reuters) – Congressional Democrats begin their drive to force President Donald Trump from office this week, with a House vote on articles of impeachment expected as early as Wednesday that could make him the only president in U.S. history to be impeached twice.

“It is important that we act, and it is important that we act in a very serious and deliberative manner,” Representative Jim McGovern, chairman of the Rules Committee, told CNN on Monday. “We expect this up on the floor on Wednesday. And I expect that it will pass.”

Thousands of Trump supporters stormed the Capitol last week, scattering lawmakers who were certifying Democratic President-elect Joe Biden’s election victory, in a harrowing assault on the center of American democracy that left five dead.

The violence came after Trump urged supporters to march on the Capitol at a rally where he repeated that his election defeat was illegitimate. House of Representatives Speaker Nancy Pelosi, many of her fellow Democrats and a handful of Republicans say Trump should not be trusted to serve out his term.

“In protecting our Constitution and our Democracy, we will act with urgency, because this President represents an imminent threat to both,” Pelosi wrote to fellow House Democrats on Sunday.

Dozens of people who attacked police officers, stole computers and smashed windows at the Capitol have been arrested for their role in the violence, and officials have opened 25 domestic terrorism investigations.

Trump acknowledged that a new administration would take office on Jan. 20 in a video statement after the attack but has not appeared in public. Twitter and Facebook have suspended his accounts, citing the risk of him inciting violence.

When the House convenes at 11 a.m. (1600 GMT) on Monday, lawmakers will bring up a resolution asking Vice President Mike Pence to invoke the never-used 25th Amendment of the U.S. Constitution, which allows the vice president and the Cabinet to remove a president deemed unfit to do the job. A recorded vote is expected on Tuesday.

McGovern said he expected Republican lawmakers to object to the request to invoke the Constitution’s 25th Amendment to remove Trump. In that case, he said, his committee will provide a rule to bring that legislation to the House for a vote and, 24 hours later, the committee will then bring another resolution to deal with impeachment.

“What this president did is unconscionable, and he needs to be held to account,” McGovern said.

Pence was in the Capitol along with his family when Trump’s supporters attacked, and he and Trump are currently not on speaking terms. But Republicans have shown little interest in invoking the 25th Amendment. Pence’s office did not respond to questions about the issue. A source said last week he was opposed to the idea.

POSSIBLE INSURRECTION CHARGE

If Pence does not act, Pelosi said the House could vote to impeach Trump on a single charge of insurrection. Aides to House Republican leader Kevin McCarthy, who voted against recognizing Biden’s victory, did not respond to a request for comment.

House Democrats impeached Trump in December 2019 for pressuring Ukraine to investigate Biden, but the Republican-controlled Senate voted not to convict him.

Democrats’ latest effort to force Trump out also faces long odds of success without bipartisan support. Only four Republican lawmakers have so far said publicly that Trump should not serve out the remaining nine days in his term.

The lawmakers who drafted the impeachment charge say they have locked in the support of at least 200 of the chamber’s 222 Democrats, indicating strong odds of passage. Biden has so far not weighed in on impeachment, saying it is a matter for Congress.

Even if the House impeaches Trump for a second time, the Senate would not take up the charges until Jan. 19 at the earliest.

An impeachment trial would tie up the Senate during Biden’s first weeks in office, preventing the new president from installing Cabinet secretaries and acting on priorities like coronavirus relief.

Representative Jim Clyburn, the No. 3 House Democrat, suggested his chamber could avoid that problem by waiting several months to send the impeachment charge over to the Senate.

A conviction could lead to Trump being barred from running for president again in 2024.

(Reporting by Andy Sullivan and Patricia Zengerle; Additional reporting by Doina Chiacu, Susan Cornwell, Steve Holland and Andrea Shalal; Editing by Scott Malone, Peter Cooney and Chizu Nomiyama)