A Unified Congress Trumps The President Every Time.

If there is any doubt about who has the most Constitutional authority, Congress has the power to impeach and remove the President and anyone else in the Executive Branch; but the President cannot remove any Member of Congress or anyone else in the Legislative Branch. And by a two-thirds vote in both houses, Congress can over-ride a Presidential veto of any bill, thereby making that bill into a law, which the President must enforce, even if he disagrees with it. And if the President deliberately refuses to enforce a law he doesn't like, then that refusal becomes a "high crime or misdemeanor" which justifies his impeachment and removal from office. Finally, if the President should be so foolish as to try to order the Military to violate a Law of The United States, the Military is obligated to disobey the President and follow the Law . So in the event of a showdown, a unified Congress trumps the President every time.