The FBI and Capitol Hill police are investigating a suspicious package containing white powder that was delivered to the home of Sen. Rand Paul (R-Ky.) on Monday, according to a senior adviser to the senator.

A large envelope arrived at the senator’s home in Kentucky and is currently being examined for harmful substances, Sergio Gor said. The sender is unknown.

“I take these threats immensely seriously," Paul said in a statement, noting that he has been "a repeated target of violence."

Paul suffered broken ribs after his neighbor, Rene Boucher, assaulted him in 2017 over a dispute about their yards. Boucher pled guilty to assaulting a member of Congress.

A spokesperson for the Capitol Hill police did not immediately respond to a request for comment.

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