By declaring Iran’s new supreme leader ‘unacceptable’, Donald Trump has tried to insert himself into a succession decided in Tehran’s clerical backrooms, not the White House.
President Donald J. Trump delivers remarks during a Saving College Sports roundtable, Friday, March 6, 2026, in the East Room of the White House. (Official White House Photo by Daniel Torok)

Donald Trump escalated tensions with Tehran on Sunday 8 March, telling US television he was ‘not happy’ with Iran’s new supreme leader, Ayatollah Mojtaba Khamenei, and branding him a ‘lightweight’ who would not ‘last long’ without American approval. The comments by Donald Trump, aired in interviews with Fox News and Axios and reported by US outlets, came just hours after Mojtaba was formally chosen as Iran’s next supreme leader in Tehran.

For context, Mojtaba Khamenei, the son of the late Ayatollah Ali Khamenei, was selected on Sunday by Iran’s Assembly of Experts, an 88‑member body of senior clerics that is empowered under Iran’s constitution to choose the country’s ultimate authority. According to the reports, his elevation followed a week of extreme volatility, including joint US‑Israeli strikes on Tehran in which Ali Khamenei and Mojtaba’s wife were killed.

Donald Trump Rejects Khamenei Successor As ‘Unacceptable’

Speaking to ‘Fox and Friends’ host Brian Kilmeade after Mojtaba’s appointment was announced, Donald Trump made clear he had no intention of greeting the succession with diplomatic restraint.

‘I am not happy,’ he said, when asked about the new supreme leader.

That blunt assessment was only part of a wider message in which Trump cast himself as a kind of external arbiter of Iran’s leadership choices. In an interview on Thursday with Axios, given before the Assembly of Experts met, he insisted he would have to ‘approve’ whoever replaced Ali Khamenei, tying that demand directly to his long‑stated goal of permanently dismantling Iran’s nuclear weapons development programme.

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‘They are wasting their time. Khamenei’s son is a lightweight. I have to be involved in the appointment, like with Delcy [Rodríguez] in Venezuela,’ Trump told Axios.

He then sharpened the point. ‘Khamenei’s son is unacceptable to me. We want someone that will bring harmony and peace to Iran,’ he added.

None of those remarks alter the basic fact that the United States has no formal role in Iran’s succession process. But they do fit neatly with Trump’s earlier rhetoric, in which he has treated the leadership question in Tehran as something that could, in theory, be influenced or even vetoed from Washington.

Donald Trump Signals Desire To Shape Iran’s Future

In case you missed it, Trump had already been leaning heavily into Iran’s internal politics long before the Assembly of Experts convened. In the months preceding the US‑Israeli strikes on Tehran, he publicly encouraged anti‑government protests aimed at toppling the theocratic regime.

After Ali Khamenei’s death, Trump told the Iranian people that ‘the hour of your freedom is at hand’, urging them to rise up against the existing system. That language, cited in the reports, sketched out a familiar posture: an American president presenting himself as a champion of regime change, even while formal policy remains more ambiguous.

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What has changed in recent days is the focus on Mojtaba himself. The reporting notes that the new supreme leader is closely connected to the Islamic Revolutionary Guard Corps and is expected to play a major role in any Iranian response to the US‑Israeli military campaign. Against that backdrop, Trump’s decision to call him a ‘lightweight’ reads less like an off‑hand insult and more like an attempt to delegitimise him at the very start of his rule.

Earlier on Sunday, even before Iran had officially confirmed Mojtaba’s selection, Trump predicted that any new leader in Tehran would not ‘last long’ without his personal approval and hinted he might be willing to back a figure from within the existing establishment.

‘There are numerous people that could qualify,’ he told ABC News, though he did not name any individual. Without additional sourcing or names, that suggestion remains entirely hypothetical and should be treated with caution. There is no independently verified evidence in the material provided that Trump has specific candidates in mind, or that he holds any concrete leverage over the Assembly of Experts.

A Dangerous Mix Of Rhetoric And Retaliation

The reports make clear that Mojtaba Khamenei’s ties to the Revolutionary Guard place him at the heart of any discussion about Iranian retaliation for the US and Israeli strikes. That reality sits awkwardly alongside Donald Trump’s framing of the succession as something akin to a personnel decision that Washington might sign off on or reject.

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By stating that Iran’s leaders are ‘wasting their time’ without his say‑so, Trump is not merely signalling disapproval. He is asserting, at least rhetorically, a right to shape who runs a country with which the United States has no diplomatic relations and a long history of confrontation.

There is no direct response from Iranian officials in the material provided, and no comment from Mojtaba Khamenei himself, so the impact of Trump’s words in Tehran can only be inferred, not confirmed. What can be said, based solely on the record here, is that a succession already fraught with risk has been met by an American president who appears determined to question the new leader’s legitimacy before he has even begun.

With military escalation still fresh and nuclear negotiations effectively frozen, the gap between what Donald Trump says he wants for Iran and what Iran’s new leadership is likely to accept looks as wide as ever.


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