President Trump fired his national security adviser, H.R. McMaster, Thursday and named John Bolton to succeed him, according to the White House. McMaster's ouster comes amid a period of particular turmoil in Trump's national security team, as Secretary of State Rex Tillerson was fired March 13 and CIA Director Mike Pompeo was named to replace him. There has been friction between Trump and McMaster. Last month, Trump upbraided McMaster after the general told a national security conference in Munich that there was “incontrovertible” evidence of Russian meddling in the 2016 presidential election.