President [[Donald Trump]] appointed McMaster as [[National Security Advisor]] on February 20, 2017, after the firing of [[Mike Flynn]]. Because McMaster was still on active duty in the Army, his appointment required the approval of the Senate Armed Services Committee and the full Senate. | President [[Donald Trump]] appointed McMaster as [[National Security Advisor]] on February 20, 2017, after the firing of [[Mike Flynn]]. Because McMaster was still on active duty in the Army, his appointment required the approval of the Senate Armed Services Committee and the full Senate. |