Legal Authorities Supporting the Activities of the National Security Agency Described by the President (US Department of Justice Office of Legal Counsel, January 19, 2006) "DOJ White Paper"
NSA's Terrorist Surveillance Program (December 16, 2005 to March 24, 2006) (Department of Justice, assorted materials)
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Journal Articles
The Bush Administration’s Terrorist Surveillance Program and the Fourth Amendment’s Warrant Requirement: Lessons from Justice Powell and the Keith Case, Tracey Maclin, University of California Davis Law Review, vol 41, no. 3, 1259 (2008)
The Surprisingly Stronger Case for the Legality of the NSA Surveillance Program: The FDR Precedent, Neal Katyal, Richard Kaplan, 60 STAN. L. REV. 1023 (2008)
What Lurks Beneath: NSA Surveillance and Executive Power, Gary Lawson, 88 Boston University Law Review 375 (2008)
The Terrorist Surveillance Program and the Constitution, John Yoo, 14 George Mason Law Review 565 (2007)
The NSA Wiretapping Program, For the Record, Vol. 1 (Center on Law and Security, NYU School of Law, January 2007)
The Constitutional Infirmity of Warrantless NSA Surveillance: The Abuse of Presidential Power and the Injury to the Fourth Amendment, Robert M. Bloom, William J. Dunn, 15 William & Mary Bill of Rights Journal 147 (2006)
The NSA Terrorist Surveillance Program, Katherine Wong, 43 Harvard Journal on Legislation 517 (2006)
Decrypting the Fourth Amendment: Warrantless NSA Surveillance and the Enhanced Expectation of Privacy Provided by Encrypted Voice Over Internet Protocol, 47 Boston College Law Review 1 (2006)
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Congressional Hearings (transcripts in pdf format)
Constitutional Limits on Domestic Surveillance (Serial No. 110-45, June 7, 2007) Hearing before the Subcommittee on the Constitution, Civil Rights, and Civil Liberties of the US House Judiciary Committee
Wartime Executive Power and the National Security Agency's Surveillance Authority (S. Hrg. 109-500, February 6, 28, and March 28, 2006) Hearing before the US Senate Judiciary Committee
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Newspaper Articles
Bush Lets U.S. Spy on Callers Without Courts (New York Times, December 16, 2005) (The article that first revealed the surveillance program)
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Misc
Presidential Authority to Conduct Warrantless Electronic Surveillance to Gather Foreign Intelligence Information (Congressional Research Service, January 5, 2006)
Presidential Authorization of Warrantless Surveillance: Research Issues, Wayne N. Renke (Alberta Institute for American Studies, University of Alberta, 2007)