Key tech giants implicated in the recent NSA surveillance revelations have asked the U.S. government for permission to prove they haven’t enabled wholesale spying. On Tuesday, Google, Facebook and Microsoft said they want to release info on how they respond to classified surveillance requests in response to the fallout over the surveillance program PRISM. According to leaked documents, the National Security Agency uses PRISM to gather data on foreign Internet users directly from the servers of nine major firms. It’s unlikely the government will grant the request. A former Justice Department prosecutor, Larry Klayman, says he plans to file a class action lawsuit today against all nine companies named in the leaked documents as PRISM participants.