How Serious is the Bluster from North Korea?

In the 60 years since the end of the Korean war, it’s hard to remember a time when the United States seemed more on edge about North Korea. The U.S. has sent B-2 stealth bombers over the peninsula in recent days and Kim Jong Un, the North's young leader, has threatened the destruction of American cities. This week on The Washington Report, David Sanger, chief Washington correspondent for The New York Times, talks to Kerry Nolan discusses the ratcheting up of tensions on the Korean peninsula.