Crush at Blackfive ("the paratrooper of love") has both clarity and a suggestion for lawmakers.
Money quote(s):
"Section 1544(b) of the War Powers Resolution states that "the President shall terminate any use of United States Armed Forces" at the end of the 60-day period unless Congress:
1.declares war or authorizes the use of force
2.extends the deadline
3.is unable to meet as a result of armed attack
I am not a lawyer, but 1,2, or 3 have not happened.
If the will of the people was to fight in Libya, either due to threatened interests or some internationalist Responsibility to Protect doctrine, Congress would have authorized force or declared war. Since they didn't, the campaign should be over. Just as you or I can't pick and chose which laws we will obey, the president can't either."
Just like consular officers don't get to pick and choose about implementing citizenship and immigration laws, so is the president similarly constrained.
However.....
There are such things as co-equal branches of the federal government, presidential authorities, and the like. There's a balance of power. The president has powers and authority as the commander-in-chief of the armed forces, but not unlimited power in that regard. Just where the line gets crossed is a bit blurry, particularly the last few decades, and the War Powers Act may actually have made things worse, even as it attempted to both bind the president and to delegate some power back over to him.
"(W)hat Congress needs to do now is to craft clear and concise laws instead of the problematic War Powers Resolution. What is a "war?" What does it mean to "declare" war? What constitutes an "enemy?" These should be black-and-white answers and not subject to debate. Therefore, future adventurist presidents will be constrained from sending troops in instances where U.S. security and interests are not threatened."
I'm not sure if some of this is even Constitutional. Can Congress (or the president, or the supreme court) go ahead and attempt to define or refine Constitutional provisions by statute rather than through the amendment process? It seems to me that the War Powers Act tries (and fails) to do that already.