The AFL-CIO called on President Trump to resign or be removed from office “at once, whether through impeachment or the 25th Amendment to the U.S. Constitution,” following the riots at the U.S. Capitol this week.

The president of the AFL-CIO, the nation’s largest federation of unions, praised President-elect Joe Biden’s nomination of Boston Mayor Marty Walsh (D) for secretary of Labor, calling the mayor an “exceptional” choice.

Prominent union leaders of the AFL-CIO and United Auto Workers are publicly condemning President Donald Trump’s supporters for storming the U.S. Capitol on Wednesday. AFL-CIO President Richard Trumka called it “one of the greatest assaults on our democracy since the Civil War.”