Who is H.R. McMaster, Trump’s new national security adviser?

President Trump named Lt. Gen. H.R. McMaster as his new national security adviser. The 54-year-old is currently a three-star general in the U.S. Army, who lead American forces in Iraq in 2005 and brought stability to a city that had been rife with ethnic conflict. Judy Woodruff learns more from Greg Jaffe of The Washington Post.