What really concerns me...
...is not the "short term" damage - this war needs to go on until the problem is solved.
It's the long term damage that has me concerned. If they want a war, why not declare it, and then invoke "war powers?" With this "undeclared" war, the executive is setting a very dangerous trend by unilaterally discovering all kinds of powers that they did not previously have. The danger comes when some further president uses this precedent to supress dissent within the country itself - and there is no immediate way to stop him, since very few people are challenging the president this time around.
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche