Uh, the President doesn't need authority to commit troops.
So..what military action do you think WOULD require the consent of Congress?
A declaration of war. What the US is carrying out against ISIS isn't war, it's protecting an ally from terrorism.
ISIS is a rebel/insurgent army. No matter how much cruelty the insurgents use an insurgency isn't an act of terrorism. Fighting a mass insurgency is war.
Not really, especially if it falls under meeting the terms on an alliance.
1. How is fighting an organized insurgency army armed with tanks, artillery etc. not a war?
2. The terms of an alliance doesn't suddenly change the
actual meaning of words and concepts.