Social media posts by Musk are raising concerns that he will use his immense platform to question the legitimacy of the vote in the U.S. presidential election.

Elon Musk deleted a post Monday morning that questioned why former President Donald Trump has faced two apparent assassination attempts in recent months while President Joe Biden and Vice President Kamala Harris have not encountered any.

The Secret Service has launched a probe into an X post by Elon Musk in which he tweeted that “no one is even trying” to kill Kamala Harris or Joe Biden. The tech billionaire deleted the post on his X platform and passed it off as a “joke.” However, the White House did not find it funny and instead called it “irresponsible.”