Professor John Yoo - North Korea and 21st Century Warfare

On Monday, North Korea’s foreign minister escalated the war of words between the U.S. and North Korea by threatening to shoot down U.S. military planes even if they flew outside his nation’s airspace. We talk with UC Berkeley School of Law Professor John Yoo, who co-authored a new book on technology and warfare, about containing North Korea. The former George W. Bush Justice Department official also shares his thoughts on the constitutionality of the Trump administration’s latest travel ban.