The Constitution is so central to American identity that any concession of external constitutional constraints may constitute a threat to national self-determination. This explains the relative intensity of objections to international norms and institutions thought to compromise constitutional discretion, at least in the absence of countervailing interests.
Peter J. Spiro,
Disaggregating U.S. Interests in International Law,
67 Law and Contemporary Problems
Available at: http://scholarship.law.duke.edu/lcp/vol67/iss4/10