Executive Summary

Iran could use disruption around the Strait of Hormuz to increase the domestic political costs of the war for Donald Trump ahead of the November 3 US midterm elections. Higher energy prices can deepen household dissatisfaction and weaken Republican prospects. Yet Iran cannot determine how voters weigh these costs against other issues, who turns out, or how votes translate into congressional seats.

Democratic control of Congress could constrain Trump through oversight, funding decisions, and, in the Senate, confirmation votes. It would not guarantee a change in US policy toward Iran. Prolonging the conflict also drains Iranian export revenue and risks alienating important partners. The central question for Tehran is whether any electoral advantage would outweigh the damage incurred while waiting. A weaker president in January would be a hollow achievement if obtaining that result left Iran with fewer resources, fewer partners, and a worse negotiating position.

The Electoral Opening

Iran’s leaders have an American deadline to consider: November 3. The midterm elections offer a possible opening for a government under military and economic pressure. Prolonged disruption around the Strait of Hormuz could deepen the household costs of the war, weaken Donald Trump’s congressional support, and ultimately constrain his final two years in office. This, in turn, could give Iran an edge in its ongoing war with the US and Israel. On September 9, Trump himself accused Iran of prolonging the conflict to influence the elections (Reuters 2026d). His accusation does not establish Iranian intent. It does, however, identify a vulnerability Tehran has reason to consider: the connection between energy insecurity and political dissatisfaction.

Republicans enter the campaign’s final stretch on the back foot. On September 6, the Financial Times reported a 7.5-point Democratic lead in generic congressional polling; its own Focaldata survey put Trump’s approval at a mere 33 percent (Financial Times 2026). These figures favor a Democratic House takeover, although national preferences do not translate directly into district victories. Candidate quality, local conditions and district boundaries can influence a national swing. The Senate also presents a higher hurdle: Democrats need a net gain of four seats, requiring successful challenges alongside the defense of vulnerable incumbents (Cappelletti 2026b). For Tehran, the distinction matters: a Democratic House could challenge Trump through investigations, legislation, and funding decisions. Democratic control of the Senate would impose additional constraints on his presidency, including the ability to block nominees.

Household Costs and Voter Priorities

The economy helps explain Republican vulnerability. America added 162,000 jobs in August, with unemployment at 4.1 percent (U.S. Bureau of Labor Statistics 2026b). Yet the inflation release published September 11 showed consumer prices 3.4 percent higher than a year earlier and gasoline prices rising 3.9 percent in August alone. The gasoline increase accounted for more than a third of the month’s overall price rise (U.S. Bureau of Labor Statistics 2026a). Employment gives the administration something to defend; however, the recurring cost of filling a tank gives dissatisfied voters something immediate to measure. A lower future inflation rate would not erase past price increases. Even if inflation slows, households will still face prices above those they paid before the increases. Voters may therefore judge the administration by whether their bills remain difficult to afford, rather than by whether the monthly inflation rate has declined.

Energy nevertheless competes with other concerns. KFF’s January polling identified healthcare costs as the leading household affordability worry (Schumacher et al. 2026). Housing, immigration, reproductive rights and presidential power also shape political choices. Republican convention messaging has sought to shift attention from household costs toward attacks on Democrats (Reid 2026), while litigation over abortion access keeps another divisive issue alive (Raymond 2026). By disrupting energy supplies, Iran can worsen one prominent source of dissatisfaction: the cost of fuel and its effects on household budgets. The electoral impact depends on how much weight Americans give those costs relative to healthcare, immigration, reproductive rights, and other concerns. Tehran cannot reliably control that balance.

Turnout and the Republican Response

Turnout adds another layer of uncertainty. Participation by roughly half of voting-age citizens is a reasonable historical benchmark: Census surveys estimated 53.4 percent turnout in 2018 and 52.2 percent in 2022 (Fabina 2023). These are, of course, only reference points, not a forecast for November. Practical barriers also matter: conflicts with work or school were the most common reason non-voters gave the Census for missing the 2022 election (Fabina 2023). This year’s surge in Democratic primary participation (Cappelletti et al. 2026a) suggests opposition energy, although competitive primaries are imperfect guides to the general election. Republicans also have substantial financial resources for advertising and mobilization (Reuters 2026b). Economic frustration might motivate Democrats, discourage disappointed Republicans or mobilize voters who want Trump to confront Iran more forcefully. The composition of the electorate matters as much as its size.

Trump’s response to the Republican party’s current dire position includes an unusually explicit financial appeal. At the September 9 Republican convention, he promised $5,000 to every adult US citizen if Republicans retain both chambers (Reuters 2026c). The proposal would require congressional approval and likely cost more than $1 trillion, with funding unresolved (Cooper 2026). Politically, the promise attaches a personal financial benefit to continued Republican control. Its credibility depends on whether voters believe Trump can deliver. His earlier claim that he could end the Russia-Ukraine war in one day illustrates the ambitious promises voters must assess (Lederer 2024).

Voting Rules and Congressional Districts

The rules governing participation deserve separate scrutiny. On September 10, a federal appeals court rejected the administration’s attempt to implement new mail-ballot restrictions, including barcode and voter-list requirements. The administration invokes election integrity; the courts, however, have warned of disenfranchisement and executive overreach, and litigation continues (Reuters 2026e). Meanwhile, Missouri’s contested congressional map illustrates efforts to improve Republican prospects through district boundaries (Campbell 2026). Such disputes concern who can participate and how votes become seats. They should not be conflated with evidence of fraudulent ballot counts. Tehran cannot assume that growing nationwide dissatisfaction with Trump’s handling of the economy and the war will translate proportionately into Republican losses.

How Hormuz Reaches American Households

Hormuz gives Iran unusual influence over the economic conditions surrounding those choices. Before the current war, approximately 20 million barrels of oil passed through the Strait daily in 2024, equivalent to one-fifth of global petroleum liquids consumption (Dunn and Barden 2025). Most shipments went to Asian markets, but oil prices connect those markets to American consumers. Domestic production offers the United States some protection against physical shortages while leaving households exposed to international price increases. An American motorist need never purchase Iranian oil to feel the consequences of disruption near Iran.

A complete closure is unnecessary for economic damage. Unreliable passage raises costs and uncertainty, and the renewed fighting that lifted oil prices in early September demonstrated how quickly markets react (Rafid 2026). Higher fuel bills leave households with less to spend elsewhere. Businesses face more expensive transport and distribution, with many of those costs reaching consumers. Persistent inflation also complicates interest rate relief. The political significance is cumulative: an overseas confrontation becomes a recurring domestic expense that challenges the administration’s promise of prosperity.

This does not require voters to sympathize with Iran. Americans can condemn Tehran’s conduct while judging Trump responsible for entering, managing, or failing to resolve an expensive conflict. The relevant electoral question is who appears capable of restoring stability.

The Costs of Waiting for Tehran

From Tehran’s perspective, the approaching election creates competing incentives. Continued disruption could make delay attractive if Iranian leaders expect Republican losses to weaken Washington. Reporting on September 12 suggested that access through Hormuz remained part of the bargaining: an Iranian source told Tasnim that an understanding with Oman did not provide for immediate reopening, according to Reuters (Reuters 2026a). That conditional position is consistent with preserving negotiating pressure.

The costs of postponement are already substantial. The Wall Street Journal reports that Iranian crude has been unable to cross the US blockade since mid-July (Kantchev and Said 2026), while Washington has helped Gulf Arab producers move substantial shipments through Hormuz (Trofimov 2026). Tehran is absorbing losses while struggling to control the extent of regional disruption. Higher energy prices also burden Asian importers, including China, complicating relations with countries Iran needs economically and diplomatically. An attempt to exhaust Trump’s political patience can simultaneously exhaust Iran’s finances and the patience of its partners.

What a Democratic Victory Could Change

A Democratic victory would still change Washington. From January 2027, a hostile House could obstruct legislation, investigate the administration and contest new appropriations through Trump’s remaining two years. A Democratic Senate could additionally block nominees. Those constraints could increase the domestic cost of sustaining an unpopular confrontation. But war-powers measures can face presidential vetoes, and overriding one requires two-thirds support in both chambers (Zengerle 2026). A narrow Democratic majority would therefore have limited ability to impose its preferred foreign policy.

Tehran would also be mistaken to equate Democratic opposition to Trump with acceptance of Iranian demands. Legislators may reject his handling of the war while supporting sanctions or military deterrence. Trump would retain substantial executive authority, and congressional obstruction could encourage him to emphasize foreign policy precisely because domestic legislation had become harder. Iran might help produce a more constrained president without producing a more conciliatory one.

The midterms consequently offer Tehran a possibility whose value depends on costs it cannot reliably calculate. Hormuz can amplify American economic dissatisfaction and narrow Trump’s freedom of action. Whether that yields useful concessions depends on voters’ judgments, congressional choices and Iran’s ability to withstand the intervening damage. A weaker president in January would be a hollow achievement if obtaining that result left Tehran with fewer resources, fewer partners and a worse negotiating position.

References

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