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,

My Chemical Romance guitarist Frank Iero had stronger words for what experts described as a Hitler-esque gesture: "f--k this guy."

Some across the political spectrum said the gesture looked like a "Heil Hitler" salute. The ADL said it was not.