President Donald Trump issued one of the most dramatic ultimatums of his presidency on Saturday night, threatening to bomb Iranian power plants — starting with the largest one — if Tehran does not fully reopen the Strait of Hormuz within 48 hours.
"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!" Trump wrote on Truth Social while spending the weekend at Mar-a-Lago in Florida.
The post was published at 7:44 p.m. ET Saturday, meaning the deadline expires at 7:44 p.m. ET on Monday, March 23.
The Escalation Nobody Expected — One Day After Trump Floated a Wind-Down
The timing of the ultimatum stunned analysts. Just 24 hours earlier, Trump had said the U.S. was considering "winding down" its military campaign, claiming he had met his goals "weeks ahead of schedule" and that the U.S. had "blown Iran off of the map."
The reversal underscores how much leverage Tehran still holds through its control — or threatened disruption — of the Strait of Hormuz. The narrow waterway off Iran's southern coast is the single most important chokepoint in global energy markets, normally responsible for roughly 20% of the world's oil supply. Since the U.S. and Israel launched "major combat operations" against Iran on February 28, the strait has been effectively closed.
The consequences for American households have been severe. Gas prices hit a nationwide average of $3.91 per gallon on Friday — up 93 cents from February 28, the day the conflict began. American drivers have collectively paid nearly $4.5 billion more for gasoline since the war started, with a typical two-car household spending $20 to $40 more per week at the pump.
What Would 'The Biggest One' Mean?
Trump did not specify which Iranian facility he was referring to, but his post has focused enormous international attention on Iran's major power infrastructure. Iran's largest power plant is widely reported to be either the Damavand Combined Cycle Power Plant on the outskirts of Tehran, or the Bushehr Nuclear Power Plant located on the Persian Gulf in southwest Iran.
Striking Bushehr — a nuclear facility — would represent an unprecedented escalation with potentially catastrophic consequences for regional radiation levels and global non-proliferation norms. The U.S. has, to date, refrained from targeting Iranian energy infrastructure entirely, with officials citing fears of the global economic fallout such strikes would trigger.
The Military Backdrop: Natanz Hit, Iran Fires Back
The ultimatum came on one of the most violent days of the war. Earlier Saturday, Iran's main nuclear enrichment site at Natanz was struck again in what Iran described as a joint U.S.-Israeli attack — though the IDF said it was not involved. The strike on Natanz marked a significant escalation in targeting Iran's nuclear program.
Iran responded by launching missile barrages at Israel. In Dimona — home to Israel's main nuclear research center — an Iranian ballistic missile struck a building, injuring dozens including a 10-year-old boy. In the southern city of Arad, 64 people were injured after Israeli air defense systems failed to intercept an incoming missile, with seven in serious condition.
Iran also targeted the Diego Garcia military base — a joint U.K.-U.S. facility in the Indian Ocean — with missiles. Britain condemned what it called Iran's "reckless attacks" and has allowed American bombers to use the base for strikes on Iran's missile sites along the Strait of Hormuz.
Meanwhile, U.S. Central Command Admiral Brad Cooper said in a video update Saturday that Iran's ability to threaten the strait had already been "degraded," adding that U.S. forces "remain on plan to eliminate Iran's ability to project meaningful power outside its borders."
22 Countries Demand Iran Reopen the Strait
Trump's ultimatum did not come in isolation. Earlier Saturday, 22 nations — including the U.K., Germany, France, Japan, and the United Arab Emirates — issued a joint statement condemning Iran's attacks on commercial vessels and oil infrastructure in the region, urging Tehran to restore free navigation.
"The effects of Iran's actions will be felt by people in all parts of the world, especially the most vulnerable," the nations said in their joint statement.
The UAE, along with 21 other countries, also expressed readiness to help secure the waterway. Trump had signaled Friday the U.S. would assist Gulf states in policing the strait "if asked."
In a parallel economic move, the Trump administration temporarily lifted sanctions on Iranian oil that was already loaded on ships as of Friday. However, Tehran dismissed the gesture, with Iran's oil ministry saying it "essentially has no crude oil left in floating storage."
The Clock Is Ticking
The deadline — 7:44 p.m. ET Monday — now hangs over global markets, diplomatic back-channels, and military command centers alike. Iran has given no public indication it plans to comply.
Trump also said Saturday that Iran wants to make a deal, but that he does not want one — arguing his military goals have been met ahead of schedule. That claim sits uneasily alongside the reality that the strait remains closed, gas prices are still climbing, and Iranian missiles are still reaching Israeli cities.
The world now has roughly 48 hours to find out whether Trump's ultimatum is a negotiating tactic — or a declaration of a new phase of war.
