Federal prosecutors have charged a Michigan man with threatening President Joe Biden and Vice President Kamala Harris.

Russell Douglas Warren, 48, of Prudenville was charged Sunday in the Eastern District of Michigan, the Detroit News reported. His attorney, listed in online court records as federal community defender Bryan Sherer, didn’t immediately return a message on Monday afternoon.

Prosecutors allege that FBI and U.S. Secret Service agents learned that Warren posted a series of messages last week on X, the social media platform formerly know as Twitter, saying that Biden and Harris had been condemned and should be taken to prison and executed by hanging.