Answer to Question 1
Administrative law does not delve into the substantive laws of administrative agencies. For example, the standards used to decide whether a person is eligible for welfare benefits are not covered by administrative law.
Answer to Question 2
The U.S. Constitution establishes many the powers of the national government, specifically the power of Congress to regulate interstate commerce and other matters. The Fifth Amendment and Fourteenth Amendments provide for the protections of due process of law and equal protection of laws. An enabling statute is a law passed by Congress that establishes an agency and sets forth the responsibilities and authority of that agency. The federal Administrative Procedure Act is a comprehensive statute governing the procedures that agencies must follow when performing their functions. An executive order is a declaration issued by the President without the approval of Congress.