Elon Musk, the world's richest man, standing behind a podium bearing the Seal of the President of the United States, on Monday twice gave what scholars, journalists and rights groups said was a Hitlergruß,

Musk then slapped his chest with his right hand, before flinging it diagonally upwards, palm face down. He turned around to audience members behind the podium, and repeated the gesture. “My heart goes out to you,