President Donald Trump said on social media that gasoline prices are not matching the decline in oil prices, so he has told the Justice Department “to immediately start looking into this.”

Crude oil prices have eased with the interim deal with Iran, which has enabled more oil tankers to start passing through the Strait of Hormuz. Prices at the pump are averaging $3.93 a gallon, according to AAA. Gasoline costs have fallen over the past month, just not as much as Trump would like.

“In other words, customers are being ‘gouged,’” Trump posted. “I have instructed the DOJ to immediately start looking into this. Gasoline prices better start going down a lot faster than what I’m seeing!”

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