talk show rounds, the chairman said the leaks don't give a full picture of the nsa program. >> he says he's got it all and is an expert on the program. he doesn't have a clue how this works. neither did the person who released just enough information to literally be dangerous. >> reporter: something the nsa chief agreed with. how the nsa gathers information and what it does remains a point of contention. >> i'm not convinced the collection of this vast trob of data led to the corruption plots. >> reporter: on capitol hill, the fight is just beginning. >> don't troll through a billion phone records every day. it invades our privacy. i'm going to see if i can challenge it. >> reporter: cnn, washington. breaking news from afghanistan this morning. a fierce battle between taliban