The top Democrats in Congress called on Thursday for President Donald Trump’s immediate removal from office for his role in urging on the violent mob that overtook the Capitol a day before, disrupting the ratification of President-elect Joseph R. Biden Jr.’s electoral victory.
Speaker Nancy Pelosi of California and Senator Chuck Schumer of New York called on Vice President Mike Pence to invoke the 25th Amendment, which allows him and the cabinet to wrest the power of the presidency from Mr. Trump.
If Mr. Pence declines to act, they said Democrats were prepared to impeach Mr. Trump for a second time.
“While it’s only 13 days left, any day can be a horror show for America,” Ms. Pelosi said, calling Mr. Trump’s actions on Wednesday a “seditious act.”
In an extraordinary news conference in the reclaimed Capitol, Ms. Pelosi singled out members of the Cabinet by name, asking why they would not intervene.
“Are they ready to say for the next 13 days this dangerous man can assault our democracy?” Ms. Pelosi said of the cabinet.
She said she hoped to have an answer from Mr. Pence within the day on whether he would attempt to use the 25th Amendment.
The two leaders tried to call Mr. Pence directly on Thursday but were left on a holding line for 20 minutes without Mr. Pence picking up.
It was unclear how quickly Democrats could move to impeach Mr. Trump.
There is no clear precedent for putting a former official on trial in the Senate, and with only 13 days left in his term, it was not certain Democrats could actually accomplish such a complicated and politically fraught process on a compressed timetable.
Mr. Schumer, the top Democrat in the Senate, said: “What happened at the U.S. Capitol yesterday was an insurrection against the United States, incited by the president. This president should not hold office one day longer.”