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Setting aside the “blame” part of your comments, congress has cut off funding for a war before, and it didn’t work out the way you’ve projected. The troops came home, poop, pot and all. Look it up.
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Actually, Congress has done it twice that I can think of right off the top of my head. First, in Vietnam, in 1973: that was after Nixon decided to withdraw troops, and after the Paris Peace Accords were signed. Second, in Somalia, after the Black Hawk Down incident, Clinton began to withdraw troops. Then Congress passed an amendment which put severe restrictions on the use of funds for military operations.
There are also cases of limiting funds to the military for specific purposes, like prohibiting funds for putting US troops in Cambodia in 1970, or prohibiting covert activities in Nicaragua in (IIRC 1984). Neither of those situations is really comparable to Iraq at this time.
The more salient point is that each of those funding restrictions were enacted into law with the approval of the President. I can name a whole slew of cases where Congress proposed cutting off funds for a military operation and that effort was not successful due to opposition from the White House. Would you like to hear about those?
If you have a case where (a) Congress refused to act to provide money for a military operation, (b) the President opposed the position of Congress, and (c) the position of Congress won out, let me know about it, because I’m utterly unaware of such a thing happening in our history.
So, what is the example you were thinking of?