President Trump and John Bolton's rocky relationship stretches back years and includes recent clashes over Bolton's criticism of Trump's summit with Vladimir Putin.

The FBI is searching the Maryland home and Washington office of ex-Trump national security adviser John Bolton as part of an investigation into the handling of classified information.

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.