The House of Representatives is poised to impeach President Trump for a second time on Wednesday for "incitement of insurrection," exactly one week after a violent siege on the U.S. Capitol left five people dead.

House Democrats have the votes to impeach Trump, who will become the first and only president in U.S. history to be impeached twice.

And in a turn of events, at least five House Republicans -- including No. 3 Rep. Liz Cheney -- have announced they, too, will vote to impeach Trump, even though no Republicans supported the effort during Trump's first impeachment proceedings related to the Ukraine matter in 2019. The other House lawmakers who say they'll vote to remove Trump include GOP Reps. John Katko, R-N.Y., Adam Kinzinger, R-Ill., Fred Upton, Mich., and Jaime Herrera Beutler, R-Wash.

House GOP leadership said they would not encourage members to vote for or against Democrats' impeachment push, according to House leadership aides, but to "vote their conscience."

In the Senate, Majority Leader Mitch McConnell has not said if he would vote to convict or whether he'd hold a trial in the Senate, ABC News has learned, but he has privately indicated he believes impeaching Trump could make it easier to rid the Republican Party of Trumpism.

-ABC News' Mariam Khan

President Trump, one week ago, encouraged thousands of his supporters to march on Capitol Hill, firing them up with baseless claims of election fraud and instructing them to "fight like hell" in order to "stop the steal,” while Congress affirmed Biden’s electoral vote victory. That day ended in a violent attack on one of the most revered buildings in America.

One week later, Trump finds himself on track to become the first president in American history to be impeached twice as the House of Representatives is scheduled to convene at 9 a.m. Wednesday to debate a rule, then debate on one article of impeachment charging the president with "incitement of insurrection." A final vote is expected later in the day.

Republicans are expected to argue Trump's rhetoric ahead of the mob Wednesday doesn't arise to an impeachable offense, and Democrats are expected to blast those 139 House Republicans who still objected to election results after the roughly six-hour siege.

With at least 218 House Democrats and five House Republicans announcing they’ll vote to impeach the president, a trial in the Senate is imminent. Half of the country's presidential impeachment trials will then belong to Trump.

While House Speaker Nancy Pelosi has not publicly indicated when the House would send the article of impeachment to the Senate after its expected passage, she plans to send it to the Senate next week, according to a source involved in the Democratic leadership deliberations on the matter.

Senate Majority Leader Mitch McConnell has said already he won't bring back the Senate from recess before Jan. 19 -- a day before Biden's inauguration. While McConnell has not said if he would vote to convict or whether he'd hold a trial in the Senate, ABC News has learned, he has privately indicated he believes impeaching Trump could make it easier to rid the Republican Party of Trumpism.

Branding his presidency as a "time to heal," both Biden and Vice President-elect Kamala Harris have deflected impeachment questions to Congress.-- but with confirmations for Cabinet picks and priorities to pass additional coronavirus relief potentially coinciding with Trump’s impeachment trial in the Senate, it’s unclear how Biden -- or the U.S. Senate -- will divide their agendas.

One week after the violent attack on the Capitol by a pro-President Trump mob, Acting Attorney General Jeffrey Rosen has appeared on camera for the first time in a video statement condemning the actions of the rioters.

Rosen spends most of the video seeking to assure the public of the department’s efforts to bring those who committed acts of violence to justice, and makes no mention of Trump or his role in inciting the rioters against the lawmakers certifying the vote for President-elect Joe Biden.

He also uses the video to “send a message” to anyone seeking to commit acts of violence in the coming days leading up to the Inauguration, saying the department will have “no tolerance” for anyone seeking to disrupt, or occupy any government buildings around the country ahead of the transfer of power on Jan 20.

-ABC News' Alexander Mallin

Following his bans from Twitter and Facebook, YouTube announced late Tuesday night that it was suspending Trump's channel for at least seven days.

"After review, and in light of concerns about the ongoing potential for violence, we removed new content uploaded to Donald J. Trump’s channel for violating our policies. It now has its 1st strike & is temporarily prevented from uploading new content for a minimum of 7 days," YouTube said in a statement Tuesday.

Trump's social media presence has come under severe scrutiny for the language and rhetoric he used leading up to after the Capitol was sieged by a mob of pro-Trump supporters.

The storming of the Capitol left at least five dead and forced Congress to evacuate and seek shelter.

"Given the ongoing concerns about violence, we will also be indefinitely disabling comments on President Trump’s channel, as we’ve done to other channels where there are safety concerns found in the comments section," YouTube said.

Eric Lander is Biden's nominee for presidential science adviser, a position Biden announced Saturday he is elevating to a Cabinet-level position for the first time in U.S. history.

Lander served as the co-chair of the President’s Council of Advisors on Science and Technology (PCAST) during the Obama-Biden administration. He currently serves as president and the founding director of the Broad Institute of MIT and Harvard. Landon is also one of the principal leaders of the Human Genome Project.

"It's not hyperbole to suggest that Dr. Lander's work has changed the course of human history. His role in helping us map the genome, pull back the curtain on human disease, allowing scientists ever since and for generations to come to explore the molecular basis for some of the most devastating illnesses affecting our world," Biden said.

In his remarks Saturday, Lander said, "The President-Elect knows that science and technology will be crucial in meeting this moment," adding that "America's greatest asset, I think, is our unrivaled diversity. After all, scientific progress is about seeing something that no one’s ever seen before. Because they bring a different lens, different experiences, different questions, different passions. No one can top America in that regard. But we have to ensure that everyone not only has a seat at the table, but a place at the lab bench."