It has been said that the Constitution is the State. It is the law which creates and regulates government itself.
Marbury v Madison: Priority must be given to the Constitution over ordinary legislative acts.
Office holders have an obligation to observe the limits of their own authority.
“I, (name), do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic, that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservations or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter.”