Perhaps you should read Article VI, clause 2 of the Constitution first.
Nah,don't read this. It makes too much sense.
Clause 2: This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.
I've read it. What's your point? Since when did the U.S. sign on to agreeing to World Court decisions? You are the one who needs a lesson in Constitutionality. This is a case of the President stretching just like our courts have been doing, especially in recent years, to promote their point of view. It is truly disgusting.
That's the legal position of a slave, or, as it is known now, 'judicial supremacy'.