John Dehn at Opinio Juris ("a forum for informed discussion and lively debate about international law and international relations") summarized the play-by-play on some international law back-and-forth.
Money quote(s):
"Opinio Juris hosted an excellent discussion of an important new book, International Law in the U.S. Supreme Court, a well-edited collection of essays about the Supreme Court’s approach to international law. Professor David Golove’s contribution asserting that post-9/11 Supreme Court “War on Terror” decisions are consistent with what he called our “Just War constitutional tradition” drew significant attention. In Professor Golove’s view, both the President and Congress are constitutionally required to comply with at least some international laws of war. Professor Andrew Kent critiqued the essay here, arguing that Golove’s claims, particularly those involving Congress, are inconsistent with Supreme Court precedent recognizing Congress’s power to set national policy in violation of international law.
I agree with Golove’s assertion that the executive branch must generally comply with any applicable international laws of war. Like Professor Kent, I am quite circumspect of the claim that Congress must as well. Harlan Cohen responded to Professor Kent’s post, suggesting that Professor Golove and Professor William Dodge (one of the book’s editors) may believe that all nations, including ours, are “absolutely bound” by certain rules of international law, those that the well-known (to the Framers and to academics) and influential Eighteenth Century international law commentator Emmerich de Vattel categorized “voluntary law.” " (Emphasis in original text. - CAA.)
There's actually no such thing as "international law."
Don't get me wrong; there is a body of customary, traditional, and treaty-based law (for values of "law") comprising a body of specialized knowledge which is generally termed "international law." But that "law" doesn't even come close to passing the common sense tests that would make it equivalent to other forms of actual law.
"After reading Professor Golove’s contribution to the book, Professor Ramsey’s response, and Professor Dodge’s related essay, I think there may be confusion regarding the obligatory nature of what Vattel denominated “voluntary law” and its relationship to both the contemporary laws of war and the war powers of Congress.
I believe Congress possesses the constitutional power (in conjunction with the executive, when necessary) to establish national war policy contrary to relevant international law so long as it does not violate the text of the Constitution. To the extent that Professor Golove’s unpublished research may have uncovered “longstanding understandings in Congress” that it must follow certain international laws of war, I suspect those understandings to be based in morality or wise policy, not necessarily constitutional law. Golove has to date given only scant evidence of what seems an elegant argument in favor of granting constitutional status to any such congressional understandings.
I agree that there are (and were) rules of international law that nations were believed “absolutely bound” to observe. They included what Vattel denominated the “perfect rights” of nations. Perfect rights were those “accompanied by the right of compelling those who refuse to fulfill the correspondent obligation” through armed force. However, the absolute “bindingness” of these rules existed only in international law." (Bold typeface added for emphasis. - CAA.)
There are some issues (more than some, but bear with me) with this perspective on the "bindingness" of international law.
For one thing, the perspective is astonishingly narrow in scope.
What we in the West call "international law" is a body of artifacts whose only relevance is within the larger context of the post-Westphalian international system. It is the height of civilizational and cultural chauvanism to suppose that it is truly global in application.
"(A) national policy, even one properly established under domestic law, may permit a violation of international law. But it cannot excuse that violation from the perspective of international law. In such cases, the policy is lawful in the domestic (municipal) legal system, but remains a violation of international law.
In my view, the key question is not whether the U.S. has ‘the power but not the right’ (to paraphrase Louis Henkin) to violate international law; it does. The key question is: which branch(es) of the U.S. government may constitutionally establish national policy contrary to international law? My research leads me to believe that in most contexts, including war, Congress does. In some very narrow circumstances it has been (and may still be) the executive alone." (Emphasis in original text. - CAA.)
The thing about violations of international law which are legal within a domestic legal system is the limited scope for enforcement. Who or what gets to enforce "international law" within another sovereign state and using what means or mechanisms?
"(T)he bulk of the contemporary international law of war (both jus ad bellum and jus in bello or international humanitarian law (IHL)) consists of customary and conventional constraints on conduct the natural law-based law of nations permitted. Therefore, contemporary IHL is not properly equated with Vattel’s “voluntary” law, which is law evidenced in or derived from natural law principles, generally observed for its utility, and obligatory on civilized states through their presumed (rather than express or implied) consent.
Vattel identifies three other categories of international law, (1) necessary, (2) customary and (3) conventional. Only necessary law, which consisted of the direct application of natural law to nations, was immutable or absolute. Vattel classified the other three types, including voluntary law, as composing the “positive law of nations” because “they proceed from the will of nations.” It defies logic to say that any species positive law cannot be altered at the will of the same nations that establish it." (Emphasis in original text. - CAA.)
"(T)o the extent that any rules in the contemporary law of war might be properly categorized “voluntary” law, the Constitution expressly assigns Congress the power to derogate from or abrogate such law. Importantly, this includes the power to infringe the “perfect rights” of other nations. Nothing in the constitutional text expressly requires Congress to exercise its powers to declare war or grant letters of marque (or reprisal, see below) in a manner consistent with relevant international law. This is why the Court did not, in its early decisions, review a congressionally established general or partial war for compliance with the law of nations."
The OJ article included a nice quote from Chief Justice Marshall (Talbot v. Seeman) to back up that last claim:
“The whole powers of war being, by the constitution of the United
States, vested in congress, the acts of that body can alone be resorted to as our guides in this enquiry [into whether France was properly deemed an enemy].” (emphasis added)
"Of course, none of these observations directly addresses Golove’s claim: that Congress believed itself to be limited by the law of nations when exercising its powers, and that this sense of obligation had a constitutional dimension or basis. There are, quite obviously, many reasons why members of Congress or Congress as a body might have boisterously made such claims. Chief among them would be to claim the legitimacy of law for proposed or adopted legislation infringing the perfect rights of other nations. Given the widely accepted origins of the natural law, some might also have felt morally obligated to observe it in spite of having constitutional discretion not to do so."
(9/6)