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President Trump has picked Lt. Gen. H.R. McMaster to be his new national security adviser, filling a key vacancy left by the ouster of former top security aide Michael Flynn.

The president called McMaster, a career Army officer, “a man of tremendous talent and tremendous experience.”

Trump made the announcement Monday at his Mar-a-Lago Club in Palm Beach, Fla., where he had been interviewing a number of candidates for the job.

His decision comes one week after he dismissed Flynn for misleading Vice President Mike Pence and others about whether he discussed U.S. sanctions with Russia’s ambassador during the transition.

Responding to a shouted question from a reporter, Trump said Pence had a role in making the pick.

“I think that combination is very, very special,” Trump told reporters while seated between the two men on a sofa in front of a table topped with a bowl of roses underneath a chandelier.

McMaster, 54, is a well-known military strategist who authored a book that criticized U.S. decision-making during the Vietnam War.

He led a cavalry regiment that retook the city of Tal Afar from al-Qaeda insurgents during the Iraq War, an operation that…