Rumsfled and Powell, and there might have been others, are good examples of what will happen to you if you don't agree with Bush. Rumsfeld and Powell did not resign they were fired. A memo by Rumsfeld, a few days before his demise, sent to the pentagon stated everything that Bush was not for and is evidence of a man that was not preparing to resign.
Bush believes that he has absolute power and it is his way or the highway.