If only we had had a deal that the entire intelligence community had agreed was working where Iran had agreed to stop developing nuclear weapons.
That would have been a nice thing to have. What a good world that would have been. Too bad... Wait. Wait. You're telling me we had that deal? And that Donald Trump is the one that ended it in his previous term, thus once again being the root cause for this conundrum?
Shit.
We can debate whether they were close to a nuke or not, or whether they'd strike as far as the West, but Iran wasn't stopping trying to create a warhead.
They resumed after it went away, and had most of a decade to get the previous stuff out of mothballs and continue.
No one seriously suggests that Iran had continued working on their nuclear weapons program while the Obama deal was in place.
Edit: The IAEA had 24/7 access to the sites and constently verified they were abiding by the deal. Trump himself testified twice they were abiding by the deal. They had dismantled their heavy-water reactor and could not produce plutonium, had gotten rid of 97% of it's enriched uranium, turned off 2/3rds of their centrifuges, and was not producing weapons grade enriched uranium.
Under the deal they did not have any uranium enriched beyond 4%. After we withdrew, they had since been able to get up to 60% enriched.