He said an agreement could come together “over the next couple of weeks, it happens”.

“I advised him that it would be inappropriate to proceed right now since we’re very close to reaching a solution,” Trump stated to journalists at the White House on Wednesday (early Thursday AEST).

“Of course, this could shift at any time, possibly with just a phone call. However, at the moment, I believe they are interested in negotiating a deal. And, if we can agree, it could save numerous lives.”

Trump’s remarks were made as the head of the United Nations’ nuclear agency mentioned that “the outcome is still uncertain” regarding talks between Iran and the US about Iran’s rapidly developing nuclear activities.

But Rafael Mariano Grossi, director-general of the International Atomic Energy Agency, described the continuing negotiations between Iran and the US as a good sign.

Grossi said he’s in near-daily conversation with Iranian Foreign Minister Abbas Araghchi, as well as talking to Steve Witkoff, the US Middle East envoy.

Grossi acknowledged one of his deputies was in Tehran on Wednesday. Iranian officials identified the official as Massimo Aparo, the head of the atomic energy agency’s safeguards arm. That’s the division that sends inspectors into Iran to monitor its program, which now enriches uranium up to 60 per cent purity — a short, technical step from weapons-grade levels of 90 per cent.

“For the moment, the jury is still out,” Grossi told journalists attending a weeklong seminar at the agency in Vienna. 

“We don’t know whether there’s going to be an agreement or not.”

However, he described the meetings as a good sign.

“I think that is an indication of a willingness to come to an agreement. And I think that, in and by itself, is something possible,” he said.

Iran and the US so far have held five rounds of talks in both Muscat, Oman and Rome, mediated by Omani Foreign Minister Badr al-Busaidi. A sixth round has yet to be set.

Talks focused on Iranian enrichment

The talks seek to limit Iran’s nuclear program in exchange for the lifting of some of the crushing economic sanctions the US has imposed on the Islamic Republic, closing in on a half-century of enmity.

Trump has repeatedly threatened to unleash airstrikes targeting Iran’s program, if a deal isn’t reached. Iranian officials increasingly warn they could pursue a nuclear weapon with their stockpile of uranium.

Trump has described Iran as having an American proposal to reach a deal. However, Iran repeatedly has denied receiving such a proposal, including on Wednesday with Mohammad Eslami, the head of the Atomic Energy Organisation of Iran.

However, if a deal is reached, Iran might allow the UN atomic energy agency to have American inspectors on their teams during inspections, Eslami said. Americans represent the largest single nationality of that agency’s employees, a 2023 agency report showed.

Iran maintains its own pressure

Before Grossi’s comments to journalists in Vienna, the head of Iran’s paramilitary Revolutionary Guard issued a new warning to the US as the negotiations go on.

“Our fingers on the trigger, we are in ambush and we are waiting,” General Hossein Salami warned. 

“If they make a mistake, they will immediately receive responses that will make them completely forget their past.”

Despite the tensions, Grossi said he believed “there’s always a way” to reach a deal between the Americans and the Iranians — even with the disagreement over enrichment.

However, he added that any possible deal likely would require a “solid, very robust” UN agency investigation of Iran’s program to understand where it stood after years of Tehran restricting inspectors’ ability to assess it.

“My conversations with my Iranian colleagues and counterparts, I always invite them to be absolutely transparent,” Grossi said. 

“And they tell me that a nuclear weapon is un-Islamic. I tell them, ‘Well, yeah. You know, that is perfect. It’s a statement that I respect. But in this business, you have to show it. You have to be verified in this.'”

Asked about his own political future, Grossi acknowledged his interest in pursuing the post of UN secretary-general, which is now held by António Guterres, whose current five-year term expires in 2027.

 But for now, “I have a lot on my plate”.