The Wall Street Journal recently reported on debates within the Obama administration about the legality of the drone war in Pakistan. State Department legal adviser Harold Koh, the former dean of Yale Law School and even more former darling of the left for his criticisms of the Bush administration’s aggressive theories of executive power, plays a prominent role in them. Koh apparently concluded that the drone war “veers near the edge” of illegality but does not quite tumble over it.

That is a questionable judgment. The U.N. Charter permits countries to use military force abroad only with the approval of the U.N. Security Council, in self-defense, or with the permission of the country in which military force is to be used. The U.N. Security Council never authorized the drone war in Pakistan. Self-defense, traditionally defined to mean the use of force against an “imminent” armed attack by a nation-state, does not apply either, because no one thinks that Pakistan plans to invade the United States. That leaves consent as the only possible legal theory.

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