U.S. billionaire Elon Musk backed Germany's Alternative for Germany (AfD) in a guest opinion piece for Germany's Welt am Sonntag newspaper published online on Saturday that prompted the commentary editor to resign in protest.

Elon Musk backed Germany’s far-right Alternative for Deutschland party, known as the AfD, in an opinion piece published in a German newspaper on Saturday, wading deeper into international politics as the billionaire has become a fixture in Trump’s orbit.

The world’s richest man, a key adviser to President-elect Donald J. Trump, ridicules critics over his backing of the German extremist party AfD, as Germany prepares for elections.