DUBAI, United Arab Emirates (AP) — U.S. President Donald Trump says countries upset by high fuel prices should “go get your own oil” as Iran maintains its chokehold on the Strait of Hormuz.

Trump expressed his frustration toward allies that have been unwilling to help the U.S. reopen the critical passageway in a social media post. “Go get your own oil,” Trump wrote. He also said they should buy from the U.S. because “we have plenty.”

His comments in a social media post on Tuesday came as average U.S. gas prices shot past $4 a gallon.