Liberal (progressive) or conservative court? How can something ever have more authority than the Constitution? It is the supreme law of the land.
Don’t imagine for a moment that I personally think that treaties take precedence over the Constitution. Unfortunately, as on many other matters, the courts do not agree with me and on this one with thee. It makes absolute sense to me that Congress would have no authority whatsoever without Constitutional grant of authority to act. The POTUS and SCOTUS likewise. However, we are talking about empire-building courts here and not logic or common sense.