FBI agents on Friday morning raided the Maryland home and Washington, D.C. office of John Bolton , the former national security adviso r to President Donald Trump and a staunch critic of the president.

The raids are part of a "national security investigation in search of classified records ," a person familiar with the matter told NBC.

The probe is eyeing multiple instances of the use of classified documents in leaks to the news media. The investigation began during the Biden administration, but did not go further before President Joe Biden left office in January.

Ten FBI agents were seen exiting Bolton's office on M Street, with boxes in hand, around 1:40 p.m. ET.

A person close to Bolton told NBC News they believe the raids are in response to Bolton's frequent criticism of

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