Memorandum of Law in Support of Application for Authority to Conduct Electronic Surveillance [...] [open pdf - 3MB]
This document was declassified on December 13, 2014. "To follow [terrorist's] trails effectively, and to respond to new leads, it is vital for the U.S. Intelligence Community to be able quickly and efficiently to acquire communications to or from individuals reasonably believed to be members or agents of these [...] foreign powers. The attached Application is intended to address these problems by establishing an early warning system under the Foreign Intelligence Surveillance Act of 1978 ('FISA') [...] to alert the U.S. Government to the presence of members and agents of these foreign powers and to aid in tracking such individuals within the United States. Specifically, the Government seeks authorization from this Court to conduct electronic surveillance to collect the substantive contents of certain telephonic and electronic communications [...]."
Office of the Director of National Intelligence: http://www.dni.gov/