John Kerry actually said...

Today, as the result of the constraints in the JPOA, Iran has halted progress on its nuclear program and it has rolled it back in key areas ...

Sanctions did not stop the advance of Iran's nuclear program. Negotiations did, and it is in our interest not to deny ourselves the chance t...

If they lose that conviction, the United States, not Iran, would be isolated, the sanctions regime would collapse.

Our goal is to conclude the major elements of the deal by the end of March and then to complete the technical details by June.