President Donald Trump’s handling of the war with Iran is becoming a growing political challenge for Republicans ahead of the November 3 U.S. midterm elections, as rising fuel prices and voter frustration threaten the party’s efforts to retain control of Congress.

According to an Associated Press report published October 27, the conflict has lasted longer than Trump initially suggested, while gasoline prices have remained above $4 per gallon since mid-June. Higher fuel costs are also putting pressure on household budgets, transportation expenses and grocery prices.

The rising cost of living is emerging as a major issue for voters, potentially weakening Republican candidates in competitive House and Senate races. Democrats are using concerns about the war and affordability to challenge the administration’s economic record.

Trump has defended his approach to Iran, arguing that the costs are justified by national security objectives. Some Republican supporters continue to back the president, but other voters have expressed concern about the conflict’s duration and its financial consequences.

Republican leaders now face a difficult political calculation: defending the administration’s foreign policy while convincing voters that the party can address everyday economic pressures.

With Election Day approaching, the Iran conflict and gasoline prices could play an important role in determining control of Congress.