Calls for President Donald Trump’s removal from office are erupting after hundreds of his supporters violently stormed the U.S. Capitol building as lawmakers attempted to certify President-elect Joe Biden’s win in the presidential election.

The takeover of the building forced the evacuation of lawmakers, staffers and members of the press. Members of Congress said they put on gas masks after tear gas was deployed inside the building, and videos and photos showed police officers with guns drawn and protesters smashing in windows of the Capitol.