Like what is happening now, completely decimating their army, navy, and air force. If that isn't enough, destroy their only source of revenue (oil fields), or go even further and destroy their electrical grid and send the country back to the stone age.
Finally, if the regime does not surrender after all this, a nuke could still be used.
Think about what you're saying. That causes hundreds of thousands of deaths of innocent civilians. Suffering of millions. Weren't you supposed to help the Iranian people? This is the opposite.
We all know he doesn't care about civilians he just want Muslims to be killed in masses and that's it, and Israel/US are carrying his dream and 50% of Americans dream to annihilate the faith of people who don't like.