John Bolton is taking over as President Trump’s National Security Advisor, replacing HR McMaster who has been the subject of much controversy since being appointed to the position when Mike Flynn was fired.

Bolton, a former US Ambassador to the United Nations, possesses a wealth of experience in foreign policy and has been a frequent contributor to Fox News.

The official transition is scheduled for April 9.

WASHINGTON (AP) — President Donald Trump is replacing national security adviser H.R. McMaster with John Bolton, a former U.S. ambassador to the United Nations.

Trump tweets that McMaster has done “an outstanding job & will always remain my friend.” He says Bolton will take over April 9.

Trump has repeatedly clashed with McMaster, a respected three-star general, and talk that McMaster would soon leave the administration had picked up in recent weeks.

His departure follows Trump’s dramatic ouster of Secretary of State Rex Tillerson last week.

It also comes after someone at the White House leaked that Trump was urged in briefing documents not to congratulate Russian President Vladimir Putin about his recent re-election win. Trump did it anyway.

McMaster was brought in after Trump’s first national security adviser, Michael Flynn, was dismissed.