WEST PALM BEACH, Fla. – Army Lt. Gen. H.R. McMaster was selected Monday by President Trump to be the administration’s national security adviser.

McMaster replaces retired Gen. Michael Flynn, whom Trump fired last week for lying to Vice President Mike Pence about conversations Flynn had with Russia’s ambassador to the United States before Trump was inaugurated.

McMaster was one of four finalists for the job. The others were former U.N. Ambassador John Bolton, acting National Security Adviser retired Lt. Gen. Keith Kellogg, and Lt. Gen. Robert Caslen, who is superintendent of the U.S. Military Academy at West Point.

Retired Vice Admiral Robert Harward reportedly turned Trump down when the job was offered to him last week.

Trump made the McMaster appointment while at Trump’s Mas-a-Lago estate.

McMaster holds a Ph.D. His dissertation turned into a critically acclaimed book “Dereliction of Duty; Johnson, McNamara, the Joint Chiefs of Staff, and the Lies that Led to Vietnam.”

He led the 3rd Armored Calvary Regiment during a deployment in Iraq.