Antony Blinken actually said...

I think what is most likely to lead to a nuclear arms race in the region is Iran getting a nuclear weapon.

We believe that the best way to proceed is based, not only the commitments they make, but also the steps they take to implement those commit...

Indeed, as we have discussed earlier, one of the most powerful levers we have to make sure that Iran makes good on any commitments it makes ...

That is a tremendous power.