Based upon your question, I would suggest that you start by reading the U.S. Constitution and then Marbury v. Madison (5 U.S. 137 (1803). Then look at the history of the Commerce Clause and how political pressure forced the SCOTUS to reverse itself on that issue. As general_re noted, an executive order or a statute can't overturn a Constitutional interpretation by the Supremes. Of course, not all Supreme Court decisions are made on constitutional grounds.