What kind of threat does Russia pose to the U.S.?

President-elect Trump has said he would like to improve relations with Russia. But his choice for defense secretary, Gen. James Mattis, views Russia as America’s number one threat. What’s the reality of the White House-Kremlin dynamic? Steve Inskeep discusses with Evelyn Farkas, a former Defense Department official, and Michael McFaul, former U.S. ambassador to Russia.