I don’t get how congress doesn’t have the power to deny/approve this war. Dont even impeach, dont you have to get congressional approval for this stuff?
One might even think that not getting Congress's permission, as required, might be an impeachable offense.
But you should read about [the War Powers Clause](https://en.wikipedia.org/wiki/War_Powers_Clause#History_and_...), and in particular, our messy, messy history with it starting at the Korean War and continuing to the present day.