Bolton served as Trump’s third national security advisor—following the brief stint of Mike Flynn and the stormy tenure of H.R. McMaster. Bolton succeeded McMaster on April 9, 2018 and remained national security advisor until he resigned on September 10, 2019. After leaving the Trump administration, he wrote a book about his tenure.

The FBI was searching the home of former national security adviser John Bolton, who has become a critic of President Trump, according to news reports.