Question: Which Supreme Court case dealt with same-sex couples, United States v. Windsor or Medellín v. Texas?
Sentence (from "Medellín v. Texas"): Also, the Court held that decisions of the International Court of Justice are not binding domestic law and that, without authority from the United States Congress or the Constitution, the President of the United States lacks the power to enforce international treaties or decisions of the International Court of Justice.
Relevant evidence: No