(CNN) – If BP's "cut and cap" operation can't stop the Gulf oil leak this week, what's the next step? A relief well won't be finished until August and that's not even guaranteed to work. What about BP's claim that all the spilled oil is on the surface of the Gulf and not in underwater plumes, despite claims to the contrary by scientists? Bob Dudley is BP's managing director and he joined us on Tuesday's American Morning to answer our questions.