The Terrorist Surveillance Program was an electronic surveillance program implemented by the National Security Agency (NSA) of the United States in the wake of the September 11, 2001 attacks. It was part of the President's Surveillance Program, which was in turn conducted under the overall umbrella of the War on Terrorism. The NSA, a signals intelligence agency, implemented the program to intercept al Qaeda communications overseas where at least one party is not a U.S. person. In 2005, The New York Times disclosed that technical glitches resulted in some of the intercepts including communications which were "purely domestic" in nature, igniting the NSA warrantless surveillance controversy. Later works, such as James Bamford's The Shadow Factory, described how the nature of the domestic sur