FBI agents on Friday searched the Bethesda, Maryland, home of former Trump national security adviser John Bolton in connection with a probe about his handling of classified records, according to The Associated Press and ABC News.

ABC’s Katherine Faulders reported the search was approved by a federal magistrate judge in Maryland.

Bolton told CNN he was unaware of the FBI search and would look into it.

Bolton, who served for 17 months in the national security adviser role in Trump’s first term, has since turned into a fierce critic of the president.

Earlier this year, Trump revoked Bolton’s Secret Service protection as well as his security clearance.