As I’ve said elsewhere, I’m dubious that Congress is going to give him an AUMF — he didn’t actually go to them first, just hauled on in, and there have been decidedly unencouraging statements on the matter from both sides of the aisle in Congress — which he’s probably going to need if he wants to continue the conflict using the US military for more than eight weeks, and he’s burned through a bit over half of that window already. He’s got kinda limited options.