In Washington, D.C., a hearing scheduled for Thursday is already drawing protests. The House Committee on Homeland Security will meet to discuss, "The Extent of Radicalization in the American Muslim Community and that Community's Response." Republican Peter King of Long Island, the committee's chair, says members of the Muslim American community should cooperate more with law enforcement. Civil rights groups say King is unfairly singling out Muslims. How significant is the threat posed by radicalized Muslim Americans? Charles Kurzman joins us. He's a professor UNC Chapel Hill.