US media outlets say House Democrats have introduced an impeachment resolution against President Donald Trump.
The Democrats are charging Trump with "incitement of insurrection" for his role in the riot at the US Capitol last week.
Critics also say the president tried to overturn the results of the November election.
A vote on the impeachment resolution is expected soon.
It is extremely unusual that impeachment procedures against a president are initiated when his term expires in less than 10 days.
The Democrats were also seeking unanimous consent for a resolution that calls on Vice President Mike Pence to convene the Cabinet and invoke the 25th Amendment to remove Trump. Republicans opposed the move. A vote on it is planned for Tuesday.