President Trump said on Wednesday that he had instructed the Department of Justice (DOJ) to open an investigation into oil companies over high gasoline prices.

In a Truth Social post, Trump said that oil companies have not lowered their prices at the pump despite a recent decline in crude prices following the U.S.–Iran preliminary agreement.

“Those prices are dropping like a rock! In other words, customers are being ‘gouged,’” he said.

“Gasoline prices better start going down a lot faster than what I’m seeing!”

Brent crude futures fell below $75 per barrel on Wednesday (back near pre-war levels), while U.S. West Texas Intermediate futures dropped to $72.29, amid the resumption of shipping traffic in the Strait of Hormuz.

Bloomberg’s energy guru, Javier Blas, remarked after President Trump’s post: 

“US President Trump, all political theatre, has just discovered the refining (and marketing) margin.”

The national average price for regular gasoline stood at $3.93 per gallon on June 23, according to the American Automobile Association (AAA), down from $4.04 the previous week.

The gas price was $4.53 per gallon a month ago.

Of course, given the supply/refinery chain, it takes time (two weeks) for crude prices to ripple through to pump prices…

AAA said it observed that gas prices remain above the levels before the conflict with Iran erupted in February.

The national average price for regular gas was $2.98 on Feb. 28, the day when the United States and Israel launched military operations against Iran, triggering the war.

“Getting prices back down to prewar levels will take longer because of the time it takes to resume shipping and production,” Marie Dodds, public affairs director for AAA Oregon/Idaho, said in a statement.

As Aldgra Fredly reports for The Epoch Times, US and Iran signed a memorandum of understanding last week to end the war. Under the agreement, the Strait of Hormuz would be fully reopened, and Tehran would not procure or develop a nuclear weapon. The United States also agreed to waive sanctions on Iranian oil for 60 days.

U.S. Secretary of Energy Chris Wright told ABC News on June 21 that commercial shipping traffic through the Strait of Hormuz had returned to normal levels, and that Americans should expect further declines in oil, gasoline, and other energy prices as traffic resumed.

“Flows of oil and natural gas through the straits have already returned to normal, and they will continue that way whatever happens with the negotiations with the Iranians,” he said.

Arsenio Dominguez, secretary-general of the International Maritime Organization, said on June 23 that more than 11,000 seafarers stranded in the region due to war would be evacuated under a coordinated effort with Iran, Oman, other coastal states in the region, the United States, and the maritime industry following the U.S.–Iran preliminary deal.

“We have secured the necessary safety guarantees and have thoroughly verified the conditions for safe navigation to support these operations,” Dominguez said in a statement.

Iran had previously blocked traffic in the Strait of Hormuz—a critical waterway through which a significant share of global oil and gas shipments passes—in response to the U.S. and Israeli attacks on its nuclear and military sites.