Interesting link -> https://keystoliberty2.wordpress.com...-constitution/.

“It would be manifestly contrary to the objectives of those who created the Constitution, let alone alien to our Constitutional history and tradition to construe Article VI (the Supremacy Clause) as permitting the United States to exercise power under an international agreement, without observing Constitutional prohibitions.? In effect such construction would permit amendment of that document in a manner not sanctioned by Article V.” – Reid v. Covert, (1957), 354 U.S. 1
Related:
Treaties Do Not Supersede the Constitution