Pope Benedict's visit to New York prompted the NYPD to increase security throughout the city, with measures that ranged from inspection checkpoints to police divers with underwater counter-terrorism devices. The extraordinary measures were very much needed, said Prof. Joseph King. "The police, both in D.C. and New York were right because he is such a high-risk target," says King and points out he is also the head of Vatican City, an independent state. "As head of state, the minute he lands on U.S. soil he's the problem of the Secret Service." Listen Now