President Donald Trump issued a blunt ultimatum to American petrol stations on Monday, ordering them to cut prices “IMMEDIATELY” and warning of “big problems” if they fail to do so. The intervention, posted on his Truth Social platform, came as the national average price of regular petrol stood at $3.86 per gallon, according to the American Automobile Association—well above the $2.50 target he set and still elevated despite a steep decline in crude oil costs since a ceasefire with Iran took hold in April. Trump said he had already instructed the Justice Department to investigate whether oil companies were illegally “gauging” consumers by not passing on lower crude prices.

The disconnect between crude and pump prices is the core of the administration’s frustration. Brent crude, which surged to $126 a barrel in late April after US and Israeli strikes on Iran and retaliatory attacks on Gulf states, has since tumbled to around $72, near its pre-conflict level of $72.48 on 27 February. Yet retail petrol, which peaked at $4.56 a gallon in late May, has fallen far more slowly. Chevron’s finance chief, Eimear Bonner, acknowledged the lag, telling CNBC that “it’s going to take time” for reductions in oil markets to show up at the pump. Viewed from Tehran, state-linked media cast the price spike as a direct consequence of “US and Zionist aggression,” while noting that the global nature of oil markets complicates any president’s ability to control costs.

The political calendar is sharpening the pressure. With midterm elections in November and Republicans defending a narrow congressional majority, consumer discontent over living costs is a live threat. Interior Secretary Doug Burgum sought to redirect blame by claiming on Fox News that petrol was 53 cents a gallon cheaper in Republican-governed “red states” than in Democratic “blue states,” urging drivers to “gas up in a red state.” California, where taxes will push the state levy to 63.4 cents per gallon on 1 July, was singled out by Trump, who called its charges “ridiculous.” At a rally on the National Mall, supporters interviewed by Fox News largely absolved Trump, pointing instead to the Iran conflict and the legacy of the Biden administration.

The next factual milestone is the scheduled meeting of US and Iranian delegations in Doha on 30 June, aimed at consolidating the fragile ceasefire. Whether a durable diplomatic framework emerges will heavily influence crude markets and, with a lag, the prices American consumers see at the pump. For now, the White House is betting that a combination of public threats, antitrust scrutiny, and the gradual normalisation of supply chains—including a temporary suspension of tariffs on Moroccan phosphate fertilisers announced the same day—can ease the affordability squeeze before voters go to the polls.