Elon Musk is mulling legal action against Minnesota Gov. Tim Walz for suggesting Musk performed the Nazi salute during his speech after President Donald Trump’s inauguration earlier this month.

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.