I see. I am def not an expert on the US constitution but my understanding that the this is still an ongoing debate - it’s not black and white, and there is some nuance. I would defer it to the US court to conclude.In this case the US constitution. Remember Bush went to Congress and got permission for Afghanistan and Iraq. It's about getting the consent of the reps of the people, making sure one man does not have the power to unilaterally declare war.
It's also needed to fund the war, as Congress approves all spending..






