President Donald Trump, center, sits with Army Lt. Gen. H.R. McMaster, left, and retired Army Lt. Gen. Keith Kellogg, right, at Trump's Mar-a-Lago estate in Palm Beach, Fla., Monday, Feb. 20, 2017, where Trump announced that McMaster will be the new national security adviser. Kellogg, who had been his acting adviser, will now serve as the National Security Council chief of staff. (AP Photo/Susan Walsh)