The executive can't seize control of the government without the cooperation/abrogation of the other two branches without a military coup.

Since Bush has not staged a coup, his "opinion" of his powers is just that--unless and until another branch of government reins him in. Which they clearly need to. Since the wheels of justice turn so slowly (unless there are votes being counted, of course), it has to be the legislative branch.

But since the party that rules Congress also has control of the White House, the investigative side has, shall we say, gotten a bit mired down?