As the threat of a second impeachment loomed, U.S. President Donald Trump acknowledged on Thursday that Joe Biden will be the next U.S. president, a day after his supporters stormed the U.S. Capitol in a stunning assault on American democracy as Congress was certifying Biden's victory.

Trump, who as recently as Thursday morning had continued to claim falsely that the election had been stolen from him, said his focus would now turn to ensuring a smooth transition to a Biden administration in a video released Thursday evening. Biden, a Democrat, is set to be sworn in on Jan. 20.

The president condemned Wednesday's violence, saying rioters had defiled the seat of American democracy.