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As the Times article linked above mentions, it is kind of ironic that we now have a Democratic president snubbing Republican congressional oversight in what is a borderline illegal abuse of executive authority. We got so used to it being the other way around.
The White House's argument is, essentially, that America's involvement in Libya does not rise to the level of war and therefore requires no congressional approval. There are no troops on the ground, American-manned aircraft have not bombed anything since April, and American personnel aren't in any real danger, they say. The US is "merely" providing logistical and intelligence support to allied operations and is using armed, unmanned drones.
The Obama administration is really splitting hairs here. If what the US is doing in Libya does not rise to the level of the "war powers" described by the act, then future presidents, acting on their own, are free to wage all-out war for 90 days and then shift to aerial bombardment and drone campaigns that continue indefinitely. Since this is what wars in the 21st Century are likely to look like, this precedent makes the War Powers Act pretty much irrelevant. No democratic oversight to speak of other than a campaign every four years. I don't know if what the administration is doing is illegal, but it's definitely antidemocratic.
Here's my simple proposal for the Libya question, the other countries where we are fighting wars of presidential decree (Pakistan and Yemen), and all future conflicts:
Require a joint resolution of Congress that declares war any time the US military is going to conduct operations that are more than a one-time strike.
It doesn't matter if the fighting is on the ground, in the air, at sea, or in space. And there should be no difference whether we're declaring war on a government, a terrorist group, or something else. The president would still have the ability to launch a strike when in "hot pursuit" of high value targets, like the raid that got bin Laden. But anything more than a one-off event would require a joint resolution of Congress.
As I've said before: Questions of war and peace are too important to be left to generals and presidents. These are questions to be put to the people. Requiring Congressional authorization for any sustained military operation is a step in that direction.