US House of Representatives will vote to ask Vice-President Mike Pence to invoke the 25th Amendment to remove Donald Trump immediately.
A vote to impeach the president will be held on Wednesday if Pence fails to act, as expected, reports the BBC.
Democrats charged Trump with "incitement of insurrection" over the invasion of the US Capitol last Wednesday. Dozens have been detained in connection with last week's violence, which left five people dead
The FBI has warned of armed protests in all 50 states by right-wing extremists ahead of Joe Biden's inauguration.
Up to 15,000 National Guard troops will be deployed in Washington DC for the 20 January event.