Ben Carson, retired neurosurgeon, Republican presidential hopeful and the author of One Nation and A More Perfect Union: What We the People Can Do to Reclaim Our Constitutional Liberties (Sentinel, 2015), talks about his campaign, the U.S. Constitution and his most recent book.

.@RealBenCarson says McCarthy's decision to step down was "an admirable thing. He put self aside" in the name of party unity.

— Brian Lehrer Show (@BrianLehrer) October 9, 2015

.@RealBenCarson on OR shooting comment: "When you hear the whole context it makes perfectly good sense. But that’s not [the media's] agenda"

— Brian Lehrer Show (@BrianLehrer) October 9, 2015