>> what's the target? where was the last time you saw bin laden? >> the cia says that information "fundamentally changed our assessment of the currier's potential hunt for bin laden." the intelligence committee and the cia are sparring over the importance of another detainee named hassan gul who gave information on bin laden's courier. the intelligence committee says "the most accurate information on abu ahmad al kuwaiti was provided by by a detainee who has not yet been subjected to the enhanced interrogation techniques." the cia say ghul gave it up after interrogation. >> it takes us pretty far by saying this guy delivered a letter from bin laden to the operations chief. that sort of nails the fact that he's in touch with bin laden and that he's actually doing things for him. >> reporter: but mclaughlin