As Robert Parry astutely observed, its about much more than sheaving the threat that Iran will get the bomb:

The April 2 framework agreement with Iran represents more than just a diplomatic deal to prevent nuclear proliferation in the Middle East. It marks a crossroad that offers a possible path for the American Republic to regain its footing and turn away from endless war.

The saliency of that observation lies in the fact that there is virtually nothing in the substance of the deal for the War Party to attack. So what they are doing is desperately hurtling the Iranian axis-of-evil narrative at the agreement, claiming that the regime is so untrustworthy, diabolical and existentially dangerous that no product of mere diplomacy is valid. The Iranians are by axiom hell-bent on evil and no mere "scrap of paper" will stop them.

But therein dwells the game-changing opportunity. To defeat the deal, the War Party will have to defend its three-decade long campaign of exaggerations, distortions and bellicose animosity toward the Iranian state.