US House Speaker Nancy Pelosi has shared with lawmakers plans to remove President Donald Trump from office before starting an impeachment process.
The House of Representatives would vote on a resolution calling on Vice-President Mike Pence to remove Mr Trump's presidential powers.
House Democrats would then introduce a charge of "incitement of insurrection" against Mr Trump over his role within the violent storming of the Capitol.
The first vote could happen on Monday.
On Sunday, Ms Pelosi wrote to lawmakers outlining plans for a resolution to formally request that Vice-President Pence invoke the 25th Amendment, which would allow him to become acting president and remove Mr Trump from the White House.
What is the 25th Amendment?
"In protecting our constitution and our democracy, we'll act with urgency, because this president represents an imminent threat to both," she said.
Her letter added that this is able to be the primary step, which House Democrats "will proceed with bringing impeachment legislation to the floor".
House whip James Clyburn, another senior Democrat, earlier told CNN that while a vote on a piece of writing of impeachment against Mr Trump was
likely to require place in the week , the party may not send any articles to the Senate for trial until after President-elect Joe Biden's first 100 days in office.
"Let's give President-elect Biden the 100 days he must get his agenda off and running," Mr Clyburn said.
That would allow Mr Biden to verify his new cabinet and kick-start key policies including tackling coronavirus - something that might need to wait if the Senate had already received the impeachment articles.
Mr Trump has made no public statements since he was banned from several social media platforms - including Twitter - on Friday.
On Sunday, however, the White House announced that the president would travel to Texas on Tuesday to visit a stretch of the border wall with Mexico to highlight his administration's work there.
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