One can certainly make that argument.
If you review the Congressional Debates, over the generations, you will note, I think, a decline in the amount of discussion that even takes place on the Constitutionality of legislation. At the same time, there has been an enormous increase in legislation completely outside anything even mentioned in the Constitution.
Your question is a very apt one.
One such writer is D. James L. Hirsen, Ph.D., who has written a remarkable book entitled: "The Coming Collision -- Global Law VS. U.S. Liberties" (ISBN 1-563-84-163-0; Huntington House Publishers).
Dr. Hirsen sounds a critical alarm concerning the global activists and their plan to implement a global agenda using the "powerful weight of international law."
Definitely recommend this book should be in the hands of everyone concerned with the slow erosion of our personal liberties and our national sovereignty.