"The Secret Service is aware of the social media post made by Elon Musk and as a matter of practice, we do not comment on matters involving protective intelligence," a spokesperson told Reuters in an email. "We can say, however, that the Secret Service investigates all threats related to our protectees."
The spokesperson declined to specify whether the agency had reached out to Musk, who seemed to suggest in follow-up posts that he had been making a joke.
"Well, one lesson I've learned is that just because I say something to a group and they laugh doesn't mean it's going to be all that hilarious as a post on X," he wrote. "Turns out that jokes are WAY less funny if people don't know the context and the delivery is plain text."
Harris, a Democrat running against Trump in the Nov. 5 presidential election, issued a statement on Sunday night as did Biden expressing relief and gratitude that Trump had not been harmed and condemning political violence.
The White House criticized Musk for his post.
"Violence should only be condemned, never encouraged or joked about. This rhetoric is irresponsible," White House spokesperson Andrew Bates said on Monday.