It is impossible to just bomb the shit out of ISIS (it is actually a slogan and nothing more). Only a ground operation can be effective in this case (or it can be ineffective but in any case you can’t expect much without it). And I hope you don’t expect Trump to begin supporting Assad in this operation.
It is what he said he is going to do. As for the ground forces, they are already there but they are bound by other terrorist armies. You see that ISIS and the so called rebels (al-Qaeda) benefit from each other´s existence. If Trump is going to lawfully intervene in Syria, he is going to ask for the Syrian government´s allowance and cooperate with the Syrian government against ISIS and al-Qaeda.