hello, i'm wolf blitzer reporting today from washington. we start with the fallout over the latest revelations about spying at the nsa and tapping of world leaders' phones. the big question people are asking now is, what did the president know and when did he know it. i'm joined by chief national security kurt correspondent jim sciutto who has been covering the story. crux of the controversy is what. >> well, the crux right now is what did the preds know and when. there's some conflicting information out there. a german newspaper reporting he knew in detailed form in 2010 about this spying going up to and including angela merkel's cell phone. this is something the white house and nsa deny. "wall street journal" reports the president was only made aware of this last summer. conflicting at this point. neither answers is satisfying because either he didn't have enough oversight or he hasn't been entirely forthcoming. demands for more information.