Once we understand the distinction between constitutional law and the Constitution, once we see that constitutional decisions need not be seen as the last words in constitutional construction, once we comprehend that these decisions do not necessarily determine future public policy, once we see all of this, we can grasp a correlative point: constitutional interpretation is not the business of the Court only, but also properly the business of all branches of government.
The Supreme Court, then, is not the only interpreter of the Constitution. Each of the three coordinate branches of government created and empowered by the Constitution-the executive and legislative no less than the judicial-has a duty to interpret the Constitution in the performance of its official functions. In fact, every official takes an oath precisely to that effect.
Edwin Meese III, The Law of the Constitution