It's part of an effort to improve congressional oversight of the government's sprawling global spying effort.

Sen. Dianne Feinstein launched the review in October 2013, after a leak by former National Security Agency systems administrator Edward Snowden disclosed that the NSA had been eavesdropping on German Chancellor Angela Merkel's cellphone. Four months earlier, Snowden had revealed the existence of other programs that vacuumed up Americans' and foreigners' phone call records and electronic communications.

"We're trying right now to look at every intelligence program," Feinstein told The Associated Press. "There are hundreds of programs we have found ... sprinkled all over. Many people in the departments don't even know (they) are going on."