IAEA Director Warns Iran Retains Nuclear Program Restart Capability

IAEA Chief Grossi warns Iran retains restart capability despite June 2025 and February 2026 military strikes.

Objective Facts

IAEA Director-General Rafael Grossi told CBS News that Iran still has the technical ability to restart its nuclear program, even though U.S. military strikes dented the program. Grossi said the IAEA also has not "seen activity" suggesting a rebuilding effort, but "a lot still has survived." "They have the capabilities, they have the knowledge, they have the industrial ability to do that." Before last June's airstrikes, the IAEA assessed that Iran had enriched some 972 pounds of uranium to 60% purity. According to the IAEA's metrics, about 92.5 pounds is theoretically enough to build a single nuclear weapon if enriched to 90%. Much of that material is likely still buried underneath the rubble, Grossi noted. Grossi said he does not believe that Iran's nuclear program can be eliminated solely by military action, describing it as "a very vast program" that has been "built throughout the years, decades of efforts, and it's scattered across a number of places," with "Facilities, Universities, laboratories, with quite sophisticated scientific and technological and industrial base."

Left-Leaning Perspective

Left-leaning outlets and arms control experts emphasized Grossi's point that military action alone cannot solve the nuclear problem. The Arms Control Association argued there was no evidence Iran was rebuilding enrichment capabilities after June 2025 strikes, and that pre-war negotiations showed promise. They highlighted that the Trump administration's "maximalist" demands for zero enrichment and facility dismantlement exceeded Iran's February 2026 negotiating position, which included IAEA oversight and limits on enrichment levels. These sources argued the war contradicted diplomatic progress. They noted that Director of National Intelligence Tulsi Gabbard testified Iran had not attempted to rebuild capabilities, yet the Trump administration struck anyway. Critics suggested Trump's team mischaracterized technical details, such as exaggerating the significance of fuel stockpiled for the Tehran Research Reactor, which the IAEA tracked and assessed as primarily for medical purposes. The left's broader narrative emphasizes that Khamenei's death and regime instability create diplomatic risks rather than military opportunities. They argue that ground operations to seize uranium would complicate IAEA verification, undermine future arms control efforts, and potentially push a weakened but surviving Iranian regime toward weaponization as a deterrent.

Right-Leaning Perspective

Right-leaning outlets and hawks acknowledged Grossi's technical warning but reframed it to justify continued military action. The Times of Israel and defense-focused analysts stressed that while strikes caused damage, Khamenei's death removed the "diplomatic shield" of his anti-nuclear fatwa, leaving 440 kilograms of 60% enriched uranium—enough for ten weapons—underground at Isfahan. They argued the new Supreme Leader Mojtaba Khamenei, chosen explicitly for "confrontation," represents a new and graver threat. These sources highlighted intelligence findings that a secret Iranian team was exploring simple nuclear weapons designs feasible with 60% uranium, achievable in six months. They cited U.S. envoy Steve Witkoff's claims that Iran boasted of having uranium for eleven bombs during negotiations. The narrative cast pre-war talks as negotiations with bad faith actors deliberately hiding military intentions under medical and civilian pretexts. The right's broader position rejects the premise that military strikes have failed. They argue strikes degraded capabilities considerably and that diplomatic pathways are now closed; only continued military pressure—including potential ground seizure of uranium—can prevent weaponization.

Deep Dive

This moment reflects a fundamental collapse of the diplomatic-military boundary in Iran policy. The IAEA chief's March 2026 statements represent a technical consensus: Iran has suffered physical damage but retains knowledge, materials, and industrial capacity to restart enrichment. Yet this consensus is being weaponized by both camps to reach opposite conclusions. The context is critical. On February 28, 2026, Khamenei was killed in a joint U.S.-Israeli strike. The fatwa died with him. This creates genuine uncertainty about Iranian decision-making. Khamenei had a policy of developing the ability to build a nuclear weapon, while holding off on actually doing so. His threshold nuclear strategy was designed to pose a deterrent to US and Israeli attacks, while staying true to his 2005 religious ban on nuclear weapons. The death of this constraining figure and the selection of his son Mojtaba for "confrontation" has shifted the incentive structure. Left-leaning analysts argue this creates a case for diplomatic off-ramps; right-leaning analysts see it as proof that military pressure must continue. On Grossi's assessment itself: his technical points are correct but incomplete. Yes, the IAEA has not "seen activity" suggesting a rebuilding effort, but "a lot still has survived." "They have the capabilities, they have the knowledge, they have the industrial ability to do that." This is true. But the left omits that since June 13, 2025, the IAEA has had no access to any of Iran's four declared enrichment facilities, cannot verify the size, location, or status of the stockpile, and cannot confirm whether enrichment has resumed. Absence of evidence is not evidence of absence. The right, meanwhile, extrapolates lack of detected rebuilding into proof of covert weapons work, which exceeds what available evidence shows. A critical unresolved question: a fourth enrichment facility — the Isfahan Fuel Enrichment Plant (IFEP) — that Iran declared just before the strikes but that the IAEA has never visited and whose precise location remains unknown. This gap in monitoring is real and troubling, but it cannot be definitively solved by either further strikes (which would deny access and invite escalation) or by diplomacy absent verification. The disagreement over negotiations is substantive. Iran's February 2026 proposal involved, after a multi-year pause on uranium enrichment, resuming an enrichment program based on fueling its planned reactors, with Iran not accumulating enriched uranium gas and agreeing to broad IAEA oversight. By contrast, the Iranian proposal, as presented on Feb. 26, did not meet the maximalist terms that the White House demanded, including no enrichment, dismantlement of Iran's nuclear facilities, and removal of enriched uranium gas from Iran. Whether this gap was bridgeable is unknowable; Trump chose strikes instead. Looking forward, the core tension is this: The IAEA has lost verification capability precisely when technical thresholds matter most. Starting from the 60% enriched material, a single cascade of 175 IR-6 centrifuges could produce the "weapons-grade" material needed for one nuclear weapon every 25 days. With more cascades, this would go proportionally faster. The only path to re-establishing knowledge is inspections, which require Iranian compliance. Both military strikes and continued military threats reduce Iranian incentives to grant access. The paradox is that military action intended to prevent weapons development may make verification impossible and push a cornered regime toward breakout.

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IAEA Director Warns Iran Retains Nuclear Program Restart Capability

IAEA Chief Grossi warns Iran retains restart capability despite June 2025 and February 2026 military strikes.

Mar 19, 2026· Updated Mar 21, 2026
What's Going On

IAEA Director-General Rafael Grossi told CBS News that Iran still has the technical ability to restart its nuclear program, even though U.S. military strikes dented the program. Grossi said the IAEA also has not "seen activity" suggesting a rebuilding effort, but "a lot still has survived." "They have the capabilities, they have the knowledge, they have the industrial ability to do that." Before last June's airstrikes, the IAEA assessed that Iran had enriched some 972 pounds of uranium to 60% purity. According to the IAEA's metrics, about 92.5 pounds is theoretically enough to build a single nuclear weapon if enriched to 90%. Much of that material is likely still buried underneath the rubble, Grossi noted. Grossi said he does not believe that Iran's nuclear program can be eliminated solely by military action, describing it as "a very vast program" that has been "built throughout the years, decades of efforts, and it's scattered across a number of places," with "Facilities, Universities, laboratories, with quite sophisticated scientific and technological and industrial base."

Left says: Military strikes cannot eliminate Iran's nuclear program; diplomacy and international inspections remain essential. Trust-building and negotiation are needed to prevent escalation and address underlying concerns.
Right says: Iran retains dangerous nuclear capabilities despite strikes. The regime's expansion of enriched uranium stockpiles and hidden facilities poses an imminent threat requiring continued military pressure and possibly ground operations.
✓ Common Ground
Multiple voices across the spectrum, including the IAEA, U.S. intelligence, and independent analysts, acknowledge that Iran possessed roughly 441 kilograms of uranium enriched to 60% as of mid-2025, enough, if further enriched, to fuel multiple nuclear weapons, according to the International Atomic Energy Agency.
Both left and right recognize that Grossi does not believe that Iran's nuclear program can be eliminated solely by military action, though they differ sharply on what this means for policy.
Supporters of further military action and advocates for diplomacy both accept that since June 13, 2025, the IAEA has had no access to any of Iran's four declared enrichment facilities and cannot verify the size, location, or status of the stockpile nor confirm whether enrichment has resumed.
Some voices on both sides note that Khamenei had a policy of developing the ability to build a nuclear weapon, while holding off on actually doing so, and his threshold nuclear strategy was designed to pose a deterrent to US and Israeli attacks, while staying true to his 2005 religious ban on nuclear weapons.
Objective Deep Dive

This moment reflects a fundamental collapse of the diplomatic-military boundary in Iran policy. The IAEA chief's March 2026 statements represent a technical consensus: Iran has suffered physical damage but retains knowledge, materials, and industrial capacity to restart enrichment. Yet this consensus is being weaponized by both camps to reach opposite conclusions.

The context is critical. On February 28, 2026, Khamenei was killed in a joint U.S.-Israeli strike. The fatwa died with him. This creates genuine uncertainty about Iranian decision-making. Khamenei had a policy of developing the ability to build a nuclear weapon, while holding off on actually doing so. His threshold nuclear strategy was designed to pose a deterrent to US and Israeli attacks, while staying true to his 2005 religious ban on nuclear weapons. The death of this constraining figure and the selection of his son Mojtaba for "confrontation" has shifted the incentive structure. Left-leaning analysts argue this creates a case for diplomatic off-ramps; right-leaning analysts see it as proof that military pressure must continue.

On Grossi's assessment itself: his technical points are correct but incomplete. Yes, the IAEA has not "seen activity" suggesting a rebuilding effort, but "a lot still has survived." "They have the capabilities, they have the knowledge, they have the industrial ability to do that." This is true. But the left omits that since June 13, 2025, the IAEA has had no access to any of Iran's four declared enrichment facilities, cannot verify the size, location, or status of the stockpile, and cannot confirm whether enrichment has resumed. Absence of evidence is not evidence of absence. The right, meanwhile, extrapolates lack of detected rebuilding into proof of covert weapons work, which exceeds what available evidence shows.

A critical unresolved question: a fourth enrichment facility — the Isfahan Fuel Enrichment Plant (IFEP) — that Iran declared just before the strikes but that the IAEA has never visited and whose precise location remains unknown. This gap in monitoring is real and troubling, but it cannot be definitively solved by either further strikes (which would deny access and invite escalation) or by diplomacy absent verification.

The disagreement over negotiations is substantive. Iran's February 2026 proposal involved, after a multi-year pause on uranium enrichment, resuming an enrichment program based on fueling its planned reactors, with Iran not accumulating enriched uranium gas and agreeing to broad IAEA oversight. By contrast, the Iranian proposal, as presented on Feb. 26, did not meet the maximalist terms that the White House demanded, including no enrichment, dismantlement of Iran's nuclear facilities, and removal of enriched uranium gas from Iran. Whether this gap was bridgeable is unknowable; Trump chose strikes instead.

Looking forward, the core tension is this: The IAEA has lost verification capability precisely when technical thresholds matter most. Starting from the 60% enriched material, a single cascade of 175 IR-6 centrifuges could produce the "weapons-grade" material needed for one nuclear weapon every 25 days. With more cascades, this would go proportionally faster. The only path to re-establishing knowledge is inspections, which require Iranian compliance. Both military strikes and continued military threats reduce Iranian incentives to grant access. The paradox is that military action intended to prevent weapons development may make verification impossible and push a cornered regime toward breakout.

◈ Tone Comparison

The left's language emphasizes diplomatic opportunity, "nobility of efforts," and technical precision about enrichment thresholds and fuel composition. The right's tone centers on existential threat, finality ("the fatwa died with him"), and moral urgency about preventing proliferation. Left sources quote Grossi's measured technical statements; right sources frame the same facts as proof of danger and justification for military action.

✕ Key Disagreements
Whether Iran is actively trying to rebuild or weaponize
Left: There is no evidence from the IAEA, from independent analysis of commercial satellite imagery, nor any evidence presented to Congress from the U.S. intelligence Community that Iran was rebuilding the damaged nuclear facilities and preparing to restart enrichment operations. The left argues Iran has shown restraint.
Right: The right cites intelligence reports of secret weapons engineering teams and satellite evidence of reconstruction activity at struck sites, arguing Iran is covertly preparing for breakout. They treat pre-war boasts during negotiations as evidence of intent.
Whether pre-war negotiations should have continued
Left: The mediating Omani foreign minister had stated significant progress, with Iran willing to make concessions, but President Trump said he was "not thrilled" with the talks. The left argues Trump abandoned a viable diplomatic pathway.
Right: The right argues that Iran's negotiating position (allowing continued enrichment) was unacceptable and masked intentions to weaponize. They defend the decision to strike as justified by intelligence and Iranian deception.
The threat timeline and imminence
Left: Grossi was asked if "the Iranians were days or weeks away from building a bomb." His response was "no." The left rejects claims of imminent threat.
Right: Trump told a meeting with congressional leaders on March 4, 2026 "If we didn't hit within two weeks, they would've had a nuclear weapon," and "When crazy people have nuclear weapons, bad things happen." The right argues urgency was justified.
Viability of ground operations to seize uranium
Left: A U.S. seizure of Iran's stockpile could have negative implications for future efforts to account for Iran's nuclear material by the IAEA, and if the United States removes material or neutralizes it onsite, that could complicate the agency's efforts to verify accountancy and provide assurance that nuclear materials have not been diverted. The left warns of operational and verification costs.
Right: The right argues that removing enriched uranium from Iranian control is necessary and that international safeguards failures under IAEA supervision already justify direct U.S. action.