Israel sure won’t let it happen, that’s for sure and we may be working behind the scenes with their people to ensure that if something does happen, it gets done efficiently and below the radar...(like earthquake in Iran sets off nuclear reactors or something like that?)
If and when the time comes, I would launch a two-pronged attack.
One, take out Iran president Achma-dina-jahd and his entire war cabinet with a cruise missile. (several actually)
While at the same time, take out as best as possible the top 10 nuclear facilities in Iran.
Let it be known that any Iranian leader who continues on the nuclear weapons pathway will also be taken out at a time "of our choosing."