James Ball and Spencer Ackerman (August 9, 2013). "NSA loophole will allow warrantless search for US citizens' emails and cellphone calls - Exclusive: Spy agency has key backdoor authorization to lookup databases for personal Americans' communications". Glenn Greenwald and Spencer Ackerman (June 27, 2013). "How the NSA is even now harvesting your on the net details". Gellmann, Barton (August 16, 2013). "NSA statements to The Post".