Back in the United States, Trump has named General H.R. McMaster to be General Michael Flynn’s replacement as national security adviser.

President Donald Trump: “So I just wanted to announce—we’ve been working all weekend very diligently, very hard—that General H.R. McMaster will become the national security adviser. He’s a man of tremendous talent and tremendous experience.”

General McMaster served in the Persian Gulf War, in Afghanistan and in Iraq. He’s well known for his 1977 book “Dereliction of Duty,” in which he criticizes Vietnam-era generals for not challenging President Lyndon Johnson and Defense Secretary Robert McNamara over their strategies. McMaster recently argued for an expansion of the U.S. Army, claiming in a 2016 testimony to a Senate Armed Services subcommittee that the Army “risks being too small to secure the nation.” This recommendation dovetails with Trump’s vows to increase the number of active-duty U.S. soldiers by tens of thousands. Trump’s choice continues his reliance on military generals for top positions, which also include General John Kelly as head of the Department of Homeland Security and General James Mattis as defense secretary.