On March 16, 2006, Senators Mike DeWine (R-OH), Lindsey Graham (R-SC), Chuck Hagel (R-NE), and Olympia Snowe (R-ME) introduced the Terrorist Surveillance Act of 2006 (S.2455), under which the President would be given certain additional limited statutory authority to conduct electronic surveillance of suspected terrorists in the United States subject to enhanced Congressional oversight. Also on March 16, 2006, Senator Arlen Specter (R-PA) introduced the National Security Surveillance Act of 2006 (), which would amend FISA to grant retroactive amnesty for warrantless surveillance conducted under presidential authority and provide FISA court (FISC) jurisdiction to review, authorize, and oversight "electronic surveillance programs". On May 24, 2006, Senator Specter and Senator Dianne Feinstein (D-CA) introduced the Foreign Intelligence Surveillance Improvement and Enhancement Act of 2006 () asserting FISA as the exclusive means to conduct foreign intelligence surveillance.