Now what would be comical (not actually comical) is to see Congress declare war for the first time since world war 2. They can do so without the presidents approval I believe, and can fund it against the presidents wishes. Now… The president can just tell the troops not to go to war though, showing how broken that system is.
No war, the president can send troops. War, the president can not send troops.
So the other representatives don’t matter to awfully much when it comes to starting wars. Now ending them on the other hand … Congress holds that with the funding part.