Trump Ultimatum to Iran Draws Criticism as Experts Warn Strikes on Power Plants May Breach International Law

President Donald Trump threatened on Saturday night to 'hit and obliterate' Iran's power plants within 48 hours, an ultimatum that legal experts and human rights organisations say could place the United States in direct violation of international humanitarian law.

The post, published on Truth Social on 21 March 2026, reads, 'If Iran doesn't FULLY OPEN, WITHOUT THREAT, the Strait of Hormuz, within 48 HOURS from this exact point in time, the United States of America will hit and obliterate their various POWER PLANTS, STARTING WITH THE BIGGEST ONE FIRST!'

The post arrived barely 24 hours after Trump said the US was considering 'winding down' its military campaign, and came as the war with Iran, launched jointly with Israel on 28 February 2026, entered its fourth week. The reversal stunned analysts and allies alike, while Iran's armed forces responded by threatening to target all US energy infrastructure in the region if its own fuel and power facilities were struck.

A 48-Hour Countdown That Shocked Even Trump's Own Allies

The ultimatum landed on one of the conflict's most violent days. Earlier on Saturday, Iran's main nuclear enrichment site at Natanz was struck in what Iranian authorities described as a joint US-Israeli attack, a characterisation the Israeli Defence Forces denied.

Iranian ballistic missiles subsequently breached Israeli air defences twice. A strike on Dimona, near Israel's nuclear research centre, injured dozens. A second volley struck the town of Arad in southern Israel, where three residential buildings suffered direct hits and more than 60 people were hospitalised, including four with serious injuries, according to Magen David Adom emergency services.

Despite those strikes, the head of US Central Command said earlier that day that Iran's ability to threaten the Strait of Hormuz had been 'degraded' and that US forces 'remain on plan to eliminate Iran's ability to project meaningful power outside its borders.' That assessment made the timing of Trump's power-plant threat particularly jarring. Al Jazeera's correspondent in Washington, Manuel Rapalo, noted a 'gap between what the White House appears to want in the Strait of Hormuz and what the US military says they have already accomplished.'

Brent crude closed at £84.14 ($112.19) per barrel on Friday, according to Fortune, as the Strait's effective closure to commercial shipping, which normally carries about 20% of global oil and gas, drove an energy supply shock. The previous day Trump had appealed for a halt to Israeli strikes on energy assets in the region, citing fears of further price escalation. Within 24 hours, he was threatening to target the same category of facilities himself.

Trump also published a second post on Saturday declaring the US military has 'blown Iran off of the map' and is 'weeks ahead of schedule,' and added, 'Their leadership is gone, their navy and air force are dead, they have absolutely no defence, and they want to make a deal. I don't!'

The Bushehr Nuclear Plant Question

Trump did not identify a specific target in his post. Iran's largest power plant is most widely reported to be either the Bushehr Nuclear Power Plant, a commercial nuclear reactor on the Persian Gulf in south-west Iran and the country's only operating nuclear power station, or the Damavand Combined Cycle Power Plant on the outskirts of Tehran. CBS News confirmed Bushehr as the most widely cited candidate for the 'biggest' plant. Striking it would represent a qualitative escalation without precedent in the current conflict and would raise immediate questions under international humanitarian law (IHL).

The legal framework at issue centres on Article 56 of Additional Protocol I to the 1949 Geneva Conventions, which the International Committee of the Red Cross (ICRC) describes as imposing a strict, though not absolute, prohibition on attacks against nuclear electrical generating stations.

According to the ICRC's published legal guidance, such facilities 'cannot be attacked just because they would have become military objectives if such an attack may cause the release of dangerous forces and consequent severe losses among the civilian population.' The ICRC adds that under certain conditions, 'launching an attack against nuclear power plants may constitute a war crime.'

The Lieber Institute at West Point, whose analyses inform US military legal doctrine, further clarifies that the Article 56 prohibition is not a proportionality calculation but an objective threshold. To avoid its application, the attacking force "must be certain that radioactive material will not be released" or that any release would not cause severe civilian losses. That standard of certainty is, the Lieber analysis notes, extremely demanding in practice.

Amnesty International's Prior Warning

Trump's power-plant threat did not arrive in a vacuum. On 11 March 2026, Amnesty International published a formal statement directed at all parties to the conflict, Israel, the United States and Iran demanding an immediate halt to 'unlawful attacks on energy infrastructure.'

The statement was issued after Israeli-US strikes on multiple fuel storage and distribution facilities in Tehran on 7 March 2026 produced, according to eyewitnesses interviewed by Amnesty, scenes of oil-tainted rainfall. The Iranian Red Crescent Society and Iran's own environmental agency advised residents of Tehran to stay indoors due to the risk of toxic chemicals and potential acid rain.

Heba Morayef, Amnesty's Regional Director for the Middle East and North Africa, said in the statement, 'The potential for vast, predictable, and devastating civilian harm arising from strikes targeting energy infrastructure, including uncontrolled deadly fires, major disruptions to essential services, environmental damage, and severe long-term health risks for millions, means there is a substantial risk such attacks would violate international humanitarian law and in some cases could amount to war crimes.'

That statement predated the power-plant ultimatum by ten days. On 8 March 2026, the Political Deputy Provincial Governor of Alborz province confirmed to the media that a strike on an oil depot in Fardis had killed at least six people and injured 21 others, including nearby residents.

The following day, the president of Alborz University of Medical Sciences confirmed a dialysis centre near the depot had been destroyed in the resulting fire, an example, Amnesty argued, of how attacks on energy infrastructure generate cascading harm to civilian medical infrastructure entirely outside the military calculus.

Iran's response to Trump's ultimatum was immediate and unambiguous. The Iranian army announced it would target all US energy infrastructure in the region if Iran's own fuel and power facilities were attacked. Iran's parliament speaker, described by NBC News as one of the regime's powerful surviving figures, said separately that the Strait 'won't return to its pre-war status,' suggesting Tehran is treating the waterway as a long-term bargaining chip rather than a concession it intends to make under a 48-hour deadline.

In the space of one social media post, a president who said 24 hours earlier he was 'winding down' a war has placed the United States on a countdown to a strike that international humanitarian law regards, at minimum, as legally perilous — and that Iran has vowed to answer with attacks on every American energy asset in the region.