International treaties are not binding domestic law unless Congress enacts statutes implementing them or unless the treaties are self-executing. Also, decisions of the International Court of Justice are not binding domestic law, and without authority from Congress or the Constitution, the president lacks the power to enforce international treaties or decisions of the International Court of Justice. Decided March 25, 2008 (argued October 10, 2007). Opinion of the Court: John Roberts → go there Dissenting: Breyer. Topic: Foreign. Medellín v. Texas, 552 U.S. 491 (2008), was a decision of the United States Supreme Court that held even when a treaty constitutes an international commitment, it is not binding domestic law unless it has been implemented by an act of the U.S. Congress or contains language expressing that it is "self-executing" upon ratification. The Court also ruled that decisions of the International Court of Justice are not binding upon the U.S. and, like treaties, cannot be enforced by the president without authority from Congress or the U.S. Constitution. Wiki link