People only drop nukes if they have do. There is no way anything nuclear will be used.
Trump had said what he is going to do, which is bad enough. He will bomb power stations, bridges and desalination plants, the same things we accuse Putin of being monstrous about.
Israel are already bombing the transport network.
To me, this will obviously hurt civilians very badly whilst having dubious military effect. And, if the Iranians retaliate and manage to hit the desalination plants of the Gulf States, we could see an unprecedented migration of people from that area and oil spiking to $200+.
Hopefully they manufacture some kind of face-saving last minute deal.