Iran has had 50 years to dig, hide and build an underground arsenal.
There are only TWO options...
1) Absolutely destroy infrastructure. Everything. Roads. Bridges. Power. Water. Airports. Runways. Comms. Yes, innocents will suffer, but so will the enemy until they cry uncle and internal power struggles take over out of desperation.
2) Ground troop invasion.
Pick you poison. Neither are good.
Neither option is available to the President.