In the Senate, a Chorus of Three Defies the Line
Vice Pres Dick Cheney met privately last July with Republican Sens John W Warner, John McCain and Lindsey Graham to ask them to toe administration line on treatment of military prisoners, but senators would not budge from their push to regulate treatment of prisoners; meeting was early hint of feud that spilled into open as Senate Republicans openly challenged Pres Bush last week on American policy in Iraq and war on terrorism; though their views on war differ, they have much in common: each is member of Armed Services Committee, has strong maverick streak and has ties to military and to one another; relationships with Bush are respectful, though not close, and each has different political agenda, but their union has become powerful political force at time when Bush's popularity is sinking and Washington is consumed with debate over Iraq; they are firm in conviction that Congress must flex its muscles after ceding authority on military matters to executive branch; photos (M)
