The Trump administration waived sanctions on the purchase of Iranian oil at sea ​for 30 days on Friday in its latest attempt to ease oil prices that have been driven up by the US-Israeli war on Iran.

The waiver ‌will bring some 140 million barrels of oil to global markets and help relieve pressure on energy supply, Treasury Secretary Scott Bessent posted on X.

The move reflects White House worries that the surge in oil prices after nearly three weeks of US and Israeli strikes on Iran will hurt US businesses and consumers ahead of the November midterm elections, when President Donald Trump’s fellow Republicans hope to retain control of ​Congress.

The licence, posted to the Treasury Department’s website after market hours, says Iranian oil can be imported into the US ​under the waiver when necessary to complete its sale or delivery.

The US has not meaningfully imported Iranian oil since Washington imposed measures ⁠after the 1979 revolution. It was unclear whether any Iranian oil would end up in the country as a result of the waiver.

Read: US issues 30-day waiver for Russian oil shipments stranded at sea

Cuba, North Korea and Crimea are among ​the regions excluded from the licence, which will remain in effect until April 19.

The move is expected to benefit China, the top buyer of Iranian oil. Energy Secretary Chris Wright said ​supplies could get to Asia within three or four days and hit the market after being refined over the coming month and a half.

It was the third time the Treasury Department has temporarily waived sanctions on oil from US adversaries in a little more than two weeks. The moves are part of the administration’s attempts to tame energy prices that have soared above $100 a barrel to the highest ​levels since 2022.

The US previously eased sanctions on Russian oil and on Friday issued a general licence allowing the sale of Iranian crude oil and petroleum products loaded on vessels ​by Friday.

“In essence, we will be using the Iranian barrels against Tehran to keep the price down as we continue Operation Epic Fury,” Bessent said.

Bessent had telegraphed the move in an interview with ‌Fox Business ⁠on Thursday, saying the release of the sanctioned Iranian oil into global supplies would help keep oil prices down for 10 to 14 days.

He said on Friday that Iran would have difficulty accessing any revenue generated by the move, and Washington would maintain maximum pressure on Iran and its ability to access the international financial system.

Running out of options

Oil prices have jumped about 50% since the US and Israel launched their attacks on February 28. Tehran has responded with attacks on Israel and the Gulf states that host US bases.

Vital energy ​infrastructure in Iran and neighbouring Gulf states ​has been attacked, and Iran has effectively ⁠closed the Strait of Hormuz, a conduit for some 20% of the world’s oil and liquefied natural gas.

Read more: How many countries have pushed back on Trump’s Hormuz ship demand?

In its effort to tame oil prices, the Trump administration on Wednesday announced a 60-day waiver of the Jones Act shipping law, temporarily allowing foreign-flagged vessels to move ​fuel, fertiliser and other goods between US ports.

Energy analysts, including Brett Erickson, a managing principal at Obsidian Risk Advisers, have said the ​administration’s efforts to control ⁠prices will not have a meaningful impact until the strait is opened to vessels.

“The easing of sanctions raises concerns about the rapid depletion of Washington’s economic toolkit,” to dampen oil prices, Erickson said. “If we’ve reached the point of loosening sanctions on the country we are at war with, we’re really running out of options.”

The US issued a 30-day waiver for countries to buy ⁠sanctioned Russian oil ​stranded at sea after a 30‑day license on March 5, specifically for India to buy Russian oil.

Mark ​Dubowitz, CEO of the Foundation for the Defence of Democracies, a nonprofit research institute considered hawkish on Iran, praised the decision.

“We’ve worked on sanctioning Iran’s oil industry for years. This is a smart move … to help win ​the fight against the regime,” Dubowitz said on X.