The president has answered a question on this about defending taiwan, defending it militarily, and said simply, yes, the u.s. will. that then, understandably, generates questions like the ones we've had this morning. is the president moving the ball forward, to say that military support would be beyond providing weapons, it would be getting involved militarily. now, what administration officials are telling us this morning, no, there is no change. is there deliberate ambiguity here to signal to china that, well, maybe that's not so rock solid anymore, that maybe the u.s. would go further here?...