text: Gerald Ford pardoning Nixon would seem to be the exception to your explanation of the Constitution.
  
  Arizona v. United States confirmed the Supreme Court history of support for the Executive branch's prosecutorial discretion through the allocation of resources. When Trump decides not to enforce provisions of the ACA or EPA laws, he is exercising the same discretion. Put simply, Congress can tell the President what not to do; it can't tell him what he has to do.