The U.S. warned Tehran of its intent to strike Iranian nuclear facilities two hours before the attack, former US Defense Minister adviser and retired Colonel Douglas MacGregor said.

“Just to be clear, the United States warned the Iranians two hours prior to the bombing of their nuclear facilities that an attack was coming,” he wrote on X.

Earlier, US President Donald Trump said that Tehran did not know until the last moment that the US was going to strike Iran’s nuclear facilities. Trump also said that no one could have imagined that the US would attack the nuclear facility in Fordow because it was considered impenetrable.

Meanwhile, the head of the UN’s nuclear watchdog, Rafael Grossi, believes that US strikes on Iran fell short of causing total damage to its nuclear program and that Tehran could restart enriching uranium “in a matter of months.”

Grossi’s comments appear to support an early US intelligence assessment, which hinted that the USA’s attack on key Iranian nuclear sites did not destroy the core components of its nuclear program.

Israel launched a bombing campaign on Iranian nuclear and military sites on June 13, saying it was aimed at keeping Iran from developing a nuclear weapon. The United States subsequently bombed three key facilities used for Tehran’s atomic program.

Iranian Foreign Minister Abbas Araghchi says the extent of the damage to the nuclear sites is “serious,” but the details are unknown. US President Donald Trump insisted Iran’s nuclear program had been set back “decades.”

However, Grossi, the Director General of the International Atomic Energy Agency, said, “Some is still standing.”

“They can have, you know, in a matter of months, I would say, a few cascades of centrifuges spinning and producing enriched uranium, or less than that,” Grossi said Friday, according to a transcript of the interview released on Saturday.

Another key question is whether Iran was able to relocate some or all of its estimated 408.6-kilo (900-pound) stockpile of highly enriched uranium before the attacks.

The uranium in question is enriched to 60 percent — above levels for civilian usage but still below weapons grade. That material, if further refined, would theoretically be sufficient to produce more than nine nuclear bombs.

Grossi admitted to CBS: “We don’t know where this material could be.”

“So some could have been destroyed as part of the attack, but some could have been moved. So there has to be at some point a clarification,” he said in the interview.

For now, Iranian lawmakers voted to suspend cooperation with the IAEA, and Tehran rejected Grossi’s request for a visit to the damaged sites, especially Fordo, the main uranium enrichment facility.

“We need to be in a position to ascertain, to confirm what is there, and where is it and what happened,” Grossi said.

In a separate interview with Fox News’s “Sunday Morning Futures” program, Trump said he did not think the stockpile had been moved.

“It’s a very hard thing to do, plus we didn’t give much notice,” he said, according to excerpts of the interview. “They didn’t move anything.”

US Secretary of State Marco Rubio on Saturday underscored Washington’s support for “the IAEA’s critical verification and monitoring efforts in Iran,” commending Grossi and his agency for their “dedication and professionalism.”

Meanwhile, Trump had earlier said that he had saved Iran’s Ayatollah Ali Khamenei from assassination and lashed out at the supreme leader for ingratitude, declaring he would order more bombing if the country tried to pursue nuclear weapons.

In an extraordinary outburst on his Truth Social platform, Trump blasted Tehran for claiming to have won its war with Israel and said he was halting work on possible sanctions relief.

Trump said the United States would bomb Iran again “without question” if intelligence indicated it was able to enrich uranium to military grade.

Trump accused the Iranian leader of ingratitude after Khamenei said in a defiant message that reports of damage to nuclear facilities were exaggerated and that Tehran had dealt Washington a “slap” in the face.

“I knew EXACTLY where he was sheltered, and would not let Israel, or the U.S. Armed Forces, by far the Greatest and Most Powerful in the World, terminate his life,” Trump posted.

“I SAVED HIM FROM A VERY UGLY AND IGNOMINIOUS DEATH, and he does not have to say, ‘THANK YOU, PRESIDENT TRUMP!'”

Asked earlier in a White House press conference whether he would consider fresh air strikes if last week’s sorties were not successful in ending Iran’s nuclear ambitions, Trump said: “Sure. Without question. Absolutely.”

Trump added that Khamenei and Iran “got beat to hell”.