The F.B.I and Capitol Police are investigating a suspicious package containing white powder that was sent to Republican Sen. Rand Paul’s home in Bowling Green, Kentucky, Monday Politico first reported.

Driving the news: Also in the large envelope was an image containing a death threat, Paul’s spokesperson Sergio Gor confirmed in an email to Axios.

  • Fox News obtained an image of the threat featuring Paul in bandages after his former neighbor Rene Boucher broke the senator’s ribs in a 2017 attack.
  • “I’ll finish what your neighbor started you motherf–ker,” the threat states.
  • It’s not yet known who sent the large envelope, but Paul tweeted that he takes “these threats immensely seriously.”

What he’s saying: “As a repeated target of violence, it is reprehensible that Twitter allows C-list celebrities to encourage violence against me and my family,” Paul said in the Twitter post.

  • He added in another tweet that he has been “targeted multiple times now.”

Context: Paul noted in a statement to Politco, “Just this weekend Richard Marx called for violence against me and now we receive this powder filled letter.”

  • Marx tweeted Sunday: “If I ever meet Rand Paul’s neighbor I’m going to hug him and buy him as many drinks as he can consume.”
  • Paul said in a Twitter post Monday night “it is reprehensible that Twitter allows C-list celebrities to advocate for violence against me and my family!”
  • Representatives for the FBI, Capitol Police, Twitter and Marx did not immediately respond to Axios’ requests for comment.

Editor’s note: This article has been updated with new details throughout.