Constitutionally speaking, under the War Powers Act, at 60 days any military action requires a vote in Congress to continue. HOWEVER, there is a 30 day 'draw down' period IF POTUS certifies the need for it. All this is done by simple majority, and it's a mandatory approval by Congress. There are specific rules for the drawdown, including no further offensive actions.
So we shall see. Will he certify the need for the 30 days? If so, will he abide by its conditions? Or will he give the finger to Congress and just continue on status quo. And if he does, will the Repugs roll over and piss on themselves?
Hmm, let's see...maybe, no, probably, definitely.
I'm sure there will be a flurry of resolutions submitted to Congress to demand a vote and/or to start an impeachment. But with the Repugs in charge, they're all doomed to failure.
It doesn't automatically start an impeachment, but it is grounds for one.