Don’t worry. Charles Krauthammer still has plenty of criticism for President Obama and his administration. But the columnist offers arguments that the Obama administration has failed to make in defending its drone war.

1. By what right does the president order the killing by drone of enemies abroad? What criteria justify assassination?

Answer: (a) imminent threat, under the doctrine of self-defense, and (b) affiliation with al-Qaeda, under the laws of war.

Imminent threat is obvious. If we know a freelance jihadist cell in Yemen is actively plotting an attack, we don’t have to wait until after the fact. Elementary self-defense justifies attacking first.

Al-Qaeda is a different matter. We are in a mutual state of war. Osama bin Laden issued his fatwa declaring war on the United States in 1996; we reciprocated three days after 9/11 with Congress’ Authorization for Use of Military Force — against al-Qaeda and those who harbor and abet it.

Regarding al-Qaeda, therefore, imminence is not required. Its members are legitimate targets, day or night, awake or asleep. Nothing new here. In World War II, we bombed German and Japanese barracks without hesitation.

Unfortunately, Obama’s Justice Department memos justifying the drone attacks are hopelessly muddled. They imply that the sole justification for drone attack is imminent threat — and whereas al-Qaeda is plotting all the time, an al-Qaeda honcho sleeping in his bed is therefore a legitimate target.

Nonsense. Slippery nonsense. It gives the impression of an administration making up criteria to fit the president’s kill list. No need to confuse categories. A sleeping Anwar al-Awlaki could lawfully be snuffed not because of imminence but because he was self-declared al-Qaeda and thus an enemy combatant as defined by congressional resolution and the laws of war.