He definitely has at least the means of applying pressure.
Completely freeze military cooperation and weapon deliveries and withdraw the Carriers they send would be possible after talks failed.
But that is not something that makes sense when you want to keep your military base in the middle east functional and regarding the vast amounts of religious people in the US it would put off parts of potential voters next year.
I think the whole aspiration of a ceasefire is just political talk so the US can say they tried their best, in the end they will support Israel in their more than questionable response to Hamas despicable provocation.
Because this was probably a military target.
A lot of militant groups use civilians as human shields to either completly prevent a strike or a least create bad publicity to spin their propaganda.
There were a lot of Israelis taken into Gaza by force, my guess is they are kept in the most important places to create a moral dilemma.
You either attack and kill your own civilians or let the enemy have undisturbed action.