The federal agents, along with approximately six FBI vehicles, were seen at Bolton's home for over an hour early this morning around 7 a.m. Local Montgomery County police were observed by ABC News blocking both entrances to Bolton's street but have since left.

The FBI raided former national security Advisor John Bolton's home in Bethesda, Maryland, on Friday as part of a “national security investigation in search of classified records,” a source familiar with the matter confirmed to NBC News. The FBI declined to comment. Bolton did not immediately respond to NBC News' request for comment.

Trump, during that first term, was churning through national security advisers with regularity, and Bolton jumped from his role as a Fox News analyst to the White House in March of 2018 after promising Trump “he wouldn’t start any wars” if he was selected, CNN reported at the time.