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.

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.

CIA Director John Ratcliffe provided FBI Director Patel the intelligence that was the basis of the search warrant , a source familiar with the matter told NBC News.