"In a rare public filing in the secret Foreign Intelligence Surveillance Court (FISC), the Justice Department today urged continued secrecy for a 2011 FISC opinion that found the National Security Agency's surveillance under the FISA Amendments Act to be unconstitutional. Significantly, the surveillance at issue was carried out under the same controversial legal authority that underlies the NSA’s recently-revealed PRISM program." [1]

[1] https://www.eff.org/deeplinks/2013/06/government-says-secret...