I blogged about this in 2003, but this struck me as worth reposting, given recent discussions of the Constitution and foreign law, and of speech restrictions in other Western countries (emphasis added):
SIGNING TREATIES MAY ERODE THE BILL OF RIGHTS: American decisions to sign on to international treaties may erode the protections of the Bill of Rights, for instance the First Amendment. Yes, the Supreme Court has supposedly said otherwise, in Reid v. Covert (1957): "[N]o agreement with a foreign nation can confer power on the [federal government] which is free from the restraints of the Constitution" (speaking of the Bill of Rights). But it turns out that this supremacy of the Bill of Rights really isn't that strong: The President and the Senate can, in the long run, "insinuat[e] international law" that would create "a partial displacement of constitutional hegemony" (for instance, with "an international norm against hate speech . . . supply[ing] a basis for prohibiting [hate speech], the First Amendment notwithstanding"). "In the short term," international norms would and should be "relevan[t] . . . in domestic constitutional interpretation." But "In the long run, it may point to the Constitution's more complete subordination."
These quotes are not from some anti-internationalist "The U.N. is coming to take away our liberties" conservatives. They are from a recent article by Prof. Peter Spiro, one of the leading American international law scholars; the article, called Treaties, International Law, and Constitutional Rights, was published in 2003 in the Stanford Law Review, which is generally seen as one of the top 3 legal journals in the country.
Prof. Spiro is both defending the notion that treaties should be able to trump constitutional rights — "If some constitutional norms are more appropriately set at the international level" (and he believes they are), "that should justify a treaty power that, in some cases, overcomes even the Bill of Rights" — and predicting that treaties will over time do so. Courts, he acknowledges, would try to "maintain the formal hegemony of the domestic constitution," but "this formal hegemony may disguise a loss of domestic constitutional autonomy over the long run." "Constitutional rights 'adjusted' by treaty norms are changed by them. The Constitution is read to conform with the treaty."
Of course, some people may be quite happy about this: They might well conclude that parts of the Bill of Rights should be superseded by "international" norms. They may think the international lawmaking community (mostly, I suspect, composed of European legal and political elites, plus of course those segments of American legal and political elites that are involved in this field) will indeed reach better results than those provided for by the current understanding of the U.S. Constitution.
But those of us who disagree should vigilantly watch for, and resist, the "displacement of constitutional hegemony" that the article welcomes. We should insist that the President and the Senate consistently stress in all the treaties they sign and ratify that our agreement to the treaty is constrained by our Constitution, and that the treaty should be read to conform to the Constitution, and not the other way around. We should criticize judges who rely on international norms in interpreting American constitutional provisions (in this respect, reading Prof. Spiro's article has led me to reconsider some of my earlier views on the subject, and to view with much more alarm reliance on international law in American constitutional interpretation). And we should assiduously publicize the ways in which international rules are, in our view, worse than ours, for instance to show that foreign bans on "hate speech" actually end up banning (as American First Amendment thinking would have suggested) a good deal of speech that deserves to be protected (see, for instance, this post by David Bernstein).
Our Constitution is far from perfect, both as written and as interpreted. I think courts should indeed change their views on many issues, and people should try to press courts to do so. But this should be our decision as Americans. We should not cede our control over our constitutional rights to international bodies, international professional elites, or even to our own President and Senate.