Separation of Powers
The White House suspended the Constitution and implemented Continuity of Government Plans on 9/11, based upon a declared state of national emergency. Bush has continually renewed the declared state of emergency up until today. See this.
The White House has done everything it could to scare people and convince them that America is under attack, as a way to justify the yearly renewal of the declared state of emergency and the continuing unconstitutional seizure of power by the executive branch.
But Congress has the power to revoke the state of emergency.