GUEST: Robert Spencer, author of Empire of God: How the Byzantines Saved Civilization.Robert Spencer is the bestselling author of The History of Jihad, The Palestinian Delusion, and Did Muhammad Exist?. He led seminars for the FBI, the US Central Command, US Army Command and General Staff College, the Asymmetric Warfare Group, and the Joint Terrorism Task Force (JTTF). Spence is the director of Jihad Watch and a Shillman Fellow at the David Horowitz Freedom Center.