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President Donald Trump granted a 90-day extension to a shipping waiver that makes it easier to move oil, fuel and fertilizer around the United States, the White House said on Friday, the latest effort to curb ‌rising energy costs ⁠linked to ⁠the war with Iran.

The move reflects a broader push by the White House to dampen politically sensitive fuel price spikes ahead of November’s ​midterm elections, where affordability is expected to be a defining issue for voters. Recent polling shows Trump and Republicans losing ground ​on the economy — once a core political strength — with approval of his economic handling falling sharply and rising gasoline prices weighing heavily on public sentiment.

The decision adds roughly three months to the existing waiver that was set ​to expire on May 17, enabling foreign-flagged vessels to move commodities between ⁠U.S. ports through ‌mid-August.

White House spokeswoman Taylor Rogers confirmed on Friday that Trump had issued the extension.