Army Lt. Gen. H.R. McMaster listens as President Donald Trump makes the announcement at Trump's Mar-a-Lago estate in Palm Beach, Fla., Monday, Feb. 20, 2017, that McMaster will be the new national security adviser. (AP/Susan Walsh)

Trump’s National Security Pick Differs With Administration On Anti-Islam Stance

McMaster has a reputation for speaking truth to power. In his 1997 book, “Dereliction of Duty,” McMaster leveled stinging criticisms at the U.S. military establishment for failures during the Vietnam War.