The ultimatum
President Trump on Saturday night posted a threat that marked the sharpest escalation of the four-week-old war with Iran. "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!" he wrote on Truth Social.
The 48-hour clock started ticking Saturday evening. If Tehran does not comply, the deadline expires Monday.
Brent crude rose to $113.20 a barrel on the news, up 0.9% on the session. WTI climbed to $98.85, gaining 0.6%. Both benchmarks have surged roughly 50% since the war began on February 28.
Tehran hits back
Iran showed no sign of backing down. Parliament Speaker Mohammad-Bagher Ghalibaf warned Sunday that "critical infrastructure, energy and oil across the region will be irreversibly destroyed and oil prices will rise for a long time" if the US strikes Iranian power plants.
Col. Ebrahim Zolfaqari, a spokesman for Iran's Khatam al-Anbiya military command, said fuel, energy, IT systems, and desalination infrastructure "used by America and the regime in the region" would be hit in retaliation.
The Islamic Revolutionary Guard Corps went further, declaring the Strait would be "completely closed" if Iran's energy grid is attacked and would stay shut until its power plants are rebuilt.
What Hormuz means for oil
The Strait of Hormuz funnels nearly one-fifth of the world's crude oil and a large share of its liquefied natural gas. Traffic through the waterway has plunged since early March, with Iran allowing only limited transit for ships it does not consider hostile.
The disruption has already pulled roughly 440 million barrels off the global market over the 22 days of conflict, according to CNBC. Iraq declared force majeure on all foreign-operated oilfields last week because it could no longer ship crude from its southern ports.
Damage that outlasts the war
IEA chief Fatih Birol told the Financial Times on Friday that restoring oil and gas flows from the Gulf could take up to six months even if the fighting stopped today. "It will be six months for some sites to be operational, others much longer," Birol said, adding that the disruption is already twice as severe as the one caused by Russia's invasion of Ukraine in 2022.
Retail gasoline prices in the US have climbed 93 cents per gallon since the conflict began. Insurance companies are refusing to cover ships transiting the strait, which has kept tanker traffic frozen regardless of military developments.
What comes next
The standoff sets up a binary outcome. If Iran reopens the strait, oil markets could see a relief rally back toward the $70-$80 range that Wall Street analysts view as a base case for late 2026. If Trump follows through on the threat and Iran retaliates against Gulf energy sites, traders and analysts say Brent could blow through $120 and test levels not seen since the 2008 spike.
As of Sunday evening, neither side appeared ready to blink.