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Trump's Iran deal "fix" will derail a policy that's working

Ayatollah Khameini speaking while seated on stage
Iran's Supreme Leader Ayatollah Ali Khamanei speaks in Tehran in October 2017. Photo: Iranian Leader's Press Office - Handout / Anadolu Agency / Getty Images

If President Trump walks away from the Iran nuclear deal, after again calling on Congress to unilaterally "correct" it during his State of the Union address, it would be the third major international agreement he has ditched.

With Europe, Russia, China and Iran unwilling to renegotiate, such a move would set the stage for withdrawal. But unlike the Trans Pacific Partnership and Paris Climate Agreement, where other parties moved on without the U.S., blowing up the Iran deal would have serious repercussions.