In this Wednesday, June 27, 2012, file photo, Vic Gundotra, Google Senior Vice President of Engineering, talks about Google Plus at the Google I/O conference in San Francisco. (AP Photo/Paul Sakuma, File)

PRISM Scandal: Google Challenges Secret Surveillance Gag Order

Tech giant asks Foreign Intelligence Surveillance Court to allow it to publish national security data requests it receives from the U.S. government.