Record diesel prices are doing something few issues have managed this election cycle: turning Republican candidates in the reddest corners of the country against President Trump's own war and energy policies, just five weeks before the midterms.

Diesel averaged roughly $6.52 a gallon nationally this week, nearly $3 higher than a year ago, while regular gasoline has climbed above $4 a gallon. The Washington Post reported Sunday that GOP candidates in solid-red parts of the country are now calling for an end to Trump's war with Iran and for a ban on diesel exports, as the issue "rattles the party's MAGA base in a way that few have in this midterm election year."

The spike is hitting truckers and farmers, core pieces of the Republican coalition, hardest, and it has already forced a public break between rural lawmakers and the White House. Sen. Chuck Grassley (R-Iowa) is leading a farm-state push for a 90-day ban on U.S. diesel exports, an effort quickly backed by other Republicans from agricultural states. Diesel hit a record high earlier this month, and lawmakers including Rep. Ashley Hinson have been pressing the administration for relief.

A Party at War With Itself

Trump has sent mixed signals on whether he will act. "I've said let's not send out the diesel. We make a lot of diesel," he told reporters on the sidelines of the United Nations General Assembly last week, adding that a decision would come "fast, one way or another." Treasury Secretary Scott Bessent said the administration was studying whether a full or partial export ban was "feasible in terms of the overall refining capacity."

But the idea has strained Republicans' traditional alliance with the oil industry. Energy Secretary Chris Wright later told the New York Times that "nobody wants a full blanket ban or zero exports of diesel," insisting "that's not being discussed," while the U.S. Chamber of Commerce and the Business Roundtable warned the White House in a joint letter that export restrictions could backfire on consumers rather than help them.

Not every Republican wants an export ban either. Sen. Lisa Murkowski (R-Alaska) has voiced skepticism that a ban would meaningfully lower prices given how interconnected global fuel markets are, while Sen. Mike Rounds (R-S.D.) has instead pushed for restarting idled refineries. The infighting has unsettled even the party's usual allies.

"WE'VE BECOME LITERALLY AS DUMB AS THE OTHER SIDE."

That's how Mike McKenna, a Republican energy lobbyist who served in Trump's first White House, described the widening gap between congressional Republicans and the fossil-fuel industry over the export-ban fight.

The disagreement exposes a broader problem for Republicans heading into November: the same fuel-price surge that helped propel Trump and the GOP to sweeping wins in 2024 has become one of their biggest midterm liabilities, particularly in rural, energy-producing and agricultural states where Democrats have shown unexpected strength this cycle. Trump has not said publicly whether he will issue a final ruling on the export ban before Election Day, and Republican strategists are divided on whether the political damage will ease if prices fall or if the standoff with Iran keeps driving headlines instead.