Senator Sheldon Whitehouse (D-RI) has been examining George W. Bush's assertions of executive power and which ones he has. Apparently, the assumption in the Oval Office is that he has whatever powers he says he has and no one can say him nay.
From what I can gather, Bush supporters do not dispute that this is how their guy operates, nor will they entertain the notion that it is not right and proper. At least, not until some Democratic President wanders into the same territory.