Former Vice President Mike Pence expressed “deep concern” Tuesday about the FBI’s search of ex-President Donald Trump’s resort home Mar-a-Lago, calling it “unprecedented” and pressing the Department of Justice to explain the shocking move.

“No former President of the United States has ever been subject to a raid of their personal residence in American history,” Pence said in a trio of tweets.

Pence’s statement came a day after Trump announced that a “large group of FBI agents” conducted an unannounced “raid” at the Palm Beach, Florida, resort, which has been Trump’s official residence since he left the White House.

“They even broke into my safe!” said Trump, who was in New York City on Monday when the FBI searched his home.

The search was related to a Justice Department probe into whether laws were broken when 15 boxes of White House records — which included some documents marked as classified — ended up at Mar-a-Lago instead of the National Archives, NBC News and other outlets reported.