Anti-Defamation League Chief Executive Jonathan Greenblatt said he didn't think Elon Musk's viral gesture to the crowd at a Monday celebration of President Trump was offensive, after it drew comparisons on social media to a Nazi salute.

Historians disagree over the significance of Musk’s gesture, which is reminiscent of the greeting used by 20th century fascists and their modern-day supporters. #EuroVerify

Musk, 53, spoke to a crowd of Trump supporters at Capital One Arena in Washington, D.C., after Trump was sworn in at the U.S. Capitol. While thanking the supporters, Musk put his right hand over his heart, then extended his arm out with his palm down. He then turned around and repeated the gesture.