NEW YORK, NY - SEPTEMBER 08: Former Mayor of New York City Rudy Giuliani testifies at a U.S. House of Representatives Committee on Homeland Security hearing at the National September 11 Memorial and Museum on September 8, 2015 in New York City. The hearing, titled "Beyond Bin Laden's Caves and Couriers to a New Generation of Terrorists: Confronting the Challenges in a Post 9/11 World," focused on global Islamic extremism, cyber security and the President Obama's Iran deal. (Photo by Andrew Burton/Getty Images)
