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.”

“Violence should only be condemned, never encouraged or joked about,” the White House said in a statement. Now the Secret Service is involved.