it's a fluid situation. they got a tough grilling today by congress. let's go to capitol hill. our senior correspondent was there watching it all unfold. how did it go, dana? >> reporter: there were four hearings today, and for the first time the congress got a chance to question parts of the war council. in hearings across the capitol, frustration and doubts about the libya mission boiled over. >> this is just the most muddled definition of an operation probably in u.s. military history. >> i am very worried about this whole idea of mission-creep. >> it's a heck of a situation when we go into a conflict and we don't know who we're supporting. >> reporter: agitated lawmakers tried and failed to get answers from the defense secretary and joint chiefs chairman on how long the mission will last and when gadhafi will go. >> the bottom line is no one can predict for you how long it will