Oil prices suffered their sharpest single-day decline in months after Democrats won control of both chambers of the U.S. Congress in the midterm elections, prompting traders to reassess the likelihood that Washington could move sooner to curb or end the nearly nine-month war with Iran.
West Texas Intermediate crude briefly fell to $87.13 a barrel on Wednesday, down more than 9.3% during the session, while Brent crude dropped to $93.22, a decline of roughly 10% and its largest one-day fall since May. WTI later stabilized near $88 a barrel and Brent recovered toward $95, but the move marked a dramatic reversal for a market that had carried a large geopolitical risk premium since fighting disrupted shipping through the Strait of Hormuz.
European natural-gas prices also fell sharply alongside crude, reflecting expectations that a reduced risk of prolonged conflict could improve energy flows from the Gulf. Even after Wednesday's selloff, oil benchmarks remained about 40% above their pre-war levels, according to the figures provided in the account.
Election result changes the political calculation
The market reaction followed Democratic victories that handed the party control of Congress and greater influence over federal spending. While the White House retains substantial authority over foreign policy and military operations, lawmakers can use appropriations legislation to place limits on defense funding and potentially constrain the duration or scale of Iran-related operations.
Senate Democratic leader Chuck Schumer said Democrats would seek to end the conflict and that some Republicans had joined that effort. House Democratic leader Hakeem Jeffries said the party would pursue legislation aimed at ending the war as well as blocking President Donald Trump's tariff policies.
J.D. Vance attributed the Republican defeat to the Iran war and said Trump had acknowledged that connection on election night. The comments placed the conflict at the center of the domestic political fallout from the vote, after months in which higher energy costs and military escalation had weighed on public debate.
Congress cannot simply direct battlefield operations, and any challenge to the administration's Iran policy would likely revolve around funding restrictions, reporting requirements, or limits on specific military activities. Those tools can be politically difficult to pass and enforce, particularly during an active conflict, but control of both chambers gives Democrats more leverage over the defense budget than they previously held.
For oil traders, that political shift created a reason to reduce bets on extended supply disruption. A ceasefire, negotiations, or even a credible move toward limiting U.S. military involvement could lower the risk premium built into Brent and WTI since the Strait of Hormuz became a focal point of the war.
Iran signals negotiations remain difficult
Iranian messaging has tempered hopes for an immediate breakthrough. Mojtaba, described in the account as Iran's leader, said on Nov. 4 that anyone expecting the U.S. election result to change Washington's hostility toward Iran was gravely mistaken.
He warned that a repeat of what Tehran considers U.S. aggression would bring a wider Iranian response and a larger war. He cited Iran's control over the Strait of Hormuz and strikes on U.S. bases in regional countries as responses to American actions.
The statements followed indications earlier in the week that Iranian negotiators had been given more room to engage. Brent had fallen more than 14% from Monday at one stage as traders interpreted those signals as a potential opening. Subsequent rhetoric suggested that major gaps remained between the parties.
Negotiations have focused on Iran's nuclear program. Trump has maintained that Tehran cannot obtain nuclear weapons, though his position on a civilian Iranian nuclear program has varied. Iran, according to the account, has pushed for reopening the Strait of Hormuz, releasing frozen overseas funds, and easing sanctions before addressing nuclear questions in depth.
That sequencing would be difficult for Washington to accept. The United States has treated the nuclear issue as the central condition for a durable settlement, while Tehran has linked its negotiating position to immediate economic relief and restored maritime access.
Shipping disruption remains an energy-market risk
The conflict's effect on oil has been driven less by a permanent loss of global production than by the threat to shipping through Hormuz, the route connecting Gulf producers with international markets.
Energy flows through the strait fell close to zero at one point after fighting began, according to the supplied figures. Volumes have since recovered to roughly 80% of pre-war levels under U.S. naval escort, easing the most acute shortage concerns without eliminating the risk of renewed disruption.
Regional officials, security companies, and analysts have reported that Iran has intensified guerrilla-style operations against shipping in recent weeks. The tactics cited include explosive underwater drones, rocket-propelled grenades, teams boarding vessels, and magnetic mines attached to ships. Such operations can disrupt tanker traffic even without a formal full-scale closure of the waterway, raising insurance, freight, and security costs for exporters and buyers.
Washington has considered further strikes, a rapid diplomatic agreement, or maintaining its current approach, each carrying distinct military and political costs. The U.S. has deployed two carrier strike groups in and around the Middle East, while a third is moving toward the Gulf, creating one of the largest U.S. regional military buildups in decades.
Fuel inventories could limit the decline
Wednesday's crude selloff does not remove the underlying tightness in fuel markets. U.S. distillate inventories fell below 100 million barrels last week, their lowest level since 2003, according to the account. Distillates include diesel and heating oil, products that are especially sensitive to refinery outages, seasonal demand, and transport constraints.
U.S. crude inventories also declined for a fifth consecutive week. Those draws leave the market more exposed if shipping through Hormuz deteriorates again or if military action damages energy infrastructure.
Lower oil prices could eventually reduce pressure on fuel costs, but the speed and scale of any consumer impact will depend on refinery margins, regional supply conditions, taxes, and the durability of the crude decline. The immediate market move reflects changing expectations around the war rather than confirmation of a ceasefire or a settled diplomatic path.
Want deeper insight into how U.S. politics move markets? Explore our analysis in this market impact guide today.
Disclaimer: The content on this page is provided for general informational purposes only and does not represent the views or financial advice of Toobit. We make no guarantees regarding the accuracy or completeness of this information and shall not be held liable for any errors, omissions, or outcomes resulting from its use. Investing in digital assets involves risk; users should independently evaluate their financial situation and the risks involved. For further details, please consult our Terms of Service and Risk Disclosure.
