Until implementing legislation is enacted, existing national law remains unchanged with respect to a non-self-governing matter and the legislation in force in the United States.121 While it is clear that non-self-executive provisions in international agreements do not supersede existing national or federal law, there is considerable scientific debate on the distinction between self-excrement and Community law. Provisions of Article 100(12) of Regulation (EC) No 1005 including the capacity of the United States Executive Agreement, an agreement between the United States and a foreign government that is less formal than a treaty and is not subject to the constitutional requirement of ratification by two-thirds of the U.S. Senate. In part because the enumerated powers of Congress and the President have been widely interpreted, most of the agreements proposed as treaties could have been proposed as agreements between Congress and the executive. That`s why the U.S. government has often chosen to use agreements between Congress and the executive rather than contracts for controversial deals that are unlikely to get the required super-majority in the Senate. The North American Free Trade Agreement (NAFTA) of 1992 and the agreement with which the United States became a member of the World Trade Organization (WTO) in 1995 are examples of controversial proposals that are dealt with in the form of agreements between Congress and the executive. .