Donal can't do anything short of starting an at least "regional war" and stop the oil circulation ... nobody wants this, first of all China that can play the Fat Boy Kim card and other nastiness.
Anyhow the US would be alone vs Iran, Saudis won't dirty their hands and won't seat with kufar killing muslims
Israel would be busy with Hezballah and it's hundred of thousands of missiles.
Iranians must have the double of what known of nuke factories hidden in the mountains among the goats
With a nuclear Iran the problem is that the next time it won't be a "regional war" anymore.