The War Powers Act.... I agree that this guys is terrible, but congress granted the president wide authority to engage in military action without their approval first when they passed this law, and presidents of both sides have used it.
Obama is not lying when he says what he says on this matter.
ONLY if there is an imminent threat.
This dork dithered for quite some time, hence no imminent threat.
If it were so danged important, he’d have acted long before now.