If Iran is deceiving us and is hell-bent on breaking out of this deal and making a dash to a bomb, we will know about it months if not years before Iran ever tests a device, let alone builds a bomb, miniaturizes it and marries it to a delivery system.
We would have more than enough notice to abort any test and neutralize Iran’s nuclear program. And the nation would unite behind action, were it seen that Iran had lied to us to buy time to build and test a bomb.
But if the Republican Party leads Congress in imposing new sanctions, and the Iranians walk out, and the NATO-Russia-China coalition breaks up, and a chance for peace in the Persian Gulf seems to have been thrown away, the GOP will pay the price. And rightly so.