The fed is at all times (supposed to be) limited by that enabling document, the Constitution. That is their authorization to act on out behalf.
If you have a problem with presidential warpowers, don’t tell me about it. The Forefathers set up the document, not me.
All it says is that for the defense of the country, the president has unlimited power. It doesn’t say unlimited, in an outward direction but very limited in an inward direction. It just says unlimited.
I think you can figure out what that means.