The most recent case of U.S. wiretapping was the NSA warrantless surveillance controversy discovered in December 2005 . It aroused much controversy after then President George W. Bush admitted to violating a specific federal statute ( FISA ) and the warrant requirement of the Fourth Amendment to the United States Constitution . The President claimed his authorization was consistent with other federal statutes ( AUMF ) and other provisions of the Constitution , it was necessary to keep America safe from terrorism and could lead to the capture of notorious terrorists responsible for the September 11 attacks in 2001
September 11 attacks
September 11 attacks
Telephone tapping