It could be make or break time for the Iran nuclear deal.

The Joint Comprehensive Plan of Action (JCPOA) was the Obama administration’s top foreign policy achievement. It led to dramatic reductions in Iran’s ability to enrich uranium in return for the U.S. and its allies lifting nuclear-related sanctions that were crippling Iran’s economy.

Former President Donald Trump abrogated the agreement just over four years ago. The Biden administration’s talks with Iran to revive the deal have since progressed impressively, but now they have stalled again.

The problem lies with one of the many new sanctions Trump imposed against Iran during his last days in office that have nothing to do with Iran’s nuclear program or the JCPOA.

Under Trump, the U.S. designated an elite Iranian military unit, the Islamic Revolutionary Guard Corps, as a foreign terrorist organization. That led to extreme sanctions against individuals and agencies connected to this group.

The designation was explicitly designed by Trump to serve as a “poison pill” that would make it politically much harder for the U.S. to rejoin the deal, since it would require lifting sanctions against a so-called “terrorist” organization.

Unfortunately, the ploy seems to have worked.

The Senate recently approved a nonbinding GOP-backed measure pressuring the Biden administration not to de-list the Revolutionary Guard, even though getting back to the agreement will be almost impossible without delisting. Diplomats on all sides are working to overcome this obstacle, but time is running short.

Trump’s blatantly political move has made the United States, the region and the world less safe.

During the period that the JCPOA was in effect, all sides agreed that Iran was in full compliance with its requirements. But still it faced devastating new sanctions from the Trump administration.

While Iran has gradually enriched uranium to higher levels since Trump abrogated the deal, it has made no attempt to acquire nuclear weapons. Returning to the JCPOA is the best way to prevent this from happening.

Israel is the region’s only current nuclear weapons state. But others — including Saudi Arabia, the United Arab Emirates, Egypt and Turkey (which already has U.S. nuclear weapons on its soil as part of NATO’s nuclear sharing) — could end up joining the nuclear club if Iran does.

To repeat, Iran has, to date, not moved toward acquiring nuclear weapons. But its people continue to endure punishing economic sanctions, with the poorest and most vulnerable always the hardest hit.

A renewed JCPOA provides a way to avoid the threat of war — initiated by one of Iran’s regional rivals, or even the United States — that would arise should Iran at some point move toward nuclear capability. It might also serve as the basis for future negotiations with Iran on broader military and regional issues, and even set the stage for beginning negotiations towards global nuclear disarmament.

Negotiations over restoring the JCPOA are ongoing, and a resolution could come soon. A separate agreement between Iran and the UN’’s nuclear watchdog agency, allowing UN inspection of Iran’s nuclear sites, is scheduled to expire around June 6. That gives sharp urgency to getting the U.S. team to the table.

There’s still time to undo Trump’s reckless abandonment of diplomacy. The last thing the world needs is another regional arms race, or another war.

Kevin Martin is the president of Peace Action and the Peace Action Education Fund. Phyllis Bennis directs the New Internationalism Project at the Institute for Policy Studies and the author of “Understanding the U.S.-Iran Crisis: A Primer.”

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