Hamdan v. Rumsfeld
(2006), a majority of the Supreme Court reaffirmed that in making reference to terms that are part and parcel of the international laws respecting the conduct of war
to cite the Latin phrase still current,
jus in bello
Congress intended courts to look to that body of law in interpreting the statutory terms.
In considering whether the AUMF allows strikes against Somalia, the pertinent international laws concern not the conduct of war but the act of going to war; that is
, jus ad bellum
. Since the adoption of the
in 1945, that law renders a nation-state's use of force illegal, as a matter of international law, unless it is undertaken with the approval of the
U.N. Security Council
. The charter permits only one exception, set forth in Article 51:
Presumably, the United States would argue that the Somalia strikes are permissible as exercises of "the inherent right of individual or collective self-defence." But that claim would not end the story. Do the words that follow
"if an armed attack occurs"
mean that the attack already must have occurred, and if so, do the attacks of Sept. 11, 2001, attributed to an al-Qaida leader then in Afghanistan, not Somalia, so satisfy this requirement that the United States may go after a different leader in a different country, nearly seven years after that other attack?
Let's assume, in the alternative, that the United States may attack before it is attacked to defend itself before it is so disabled that it cannot engage in self-defense. This seems reasonable; after all, the law generally allows a person who has a gun pointed at her to shoot first and not to wait for the assailant to shoot her before she may act to defend herself. Indeed, this reasoning is enshrined in international law as "anticipatory self-defense," a concept established more than 170 years ago during the
between the United States and Britain.
Accepting "anticipatory self-defense" as law does not end the inquiry, however. The exchange of letters that ended the
dispute indicate conditions upon this right
conditions of "necessity" and "proportionality" that may be found in other doctrines relating to the use of force, such as the old doctrine of
, as our colleague, Notre Dame Law Professor
Mary Ellen O'Connell
. Within those two terms may be found a rule that use of force in self-defense must be genuinely necessary, that the threat must be imminent, that there must be no opportunity for deliberation or negotiation, and further that the use of force must be proportionate to the threat, so that any permissible strike goes after only the person(s) or camp(s) that are a menace, and avoids as much as possible any damage to any innocent person or any uninvolved item of property.
The U.S. Congress ought to be presumed to understand these well-settled principles
principles that derive from a dispute involving the United States itself. Thus its decision explicitly to require in the AUMF use of force be both "necessary" and "appropriate"
words nearly identical to the international law doctrine's "necessity" and "proportionate"
ought to be understood as limiting post-9/11 use of force to that which meets these requirements.