[muawiyah]

Congress authorized the use of force ~ to wit, they declared war in response to an attack.

Once you do that you only have one way to quit ~ you need a treaty approved with a 2/3 majority.

[BatMite]

Not at all. What Congress authorizes, it can un-authorize (and, in any case, the President doesn’t have to make use of the authorization in the first place, or continue to use it indefinitely).