Senate Democratic Leader Chuck Schumer is calling for the 25th Amendment to be invoked. He declined to comment on this yesterday when CNN asked.
“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," Schumer said in the statement.
The 25th Amendment has periodically been discussed as a means of last resort to remove a rogue or incapacitated president.
To forcibly wrest power from Trump, Vice President Mike Pence would have to be on board, according to the text of the amendment (read the full language here).