The Democrats’ victory in both chambers of the US Congress marks a major setback for Donald Trump’s administration. But will it change American foreign policy? From the war with Iran and trade disputes with Europe and China to NATO and Ukraine, the consequences affect global energy prices, investment decisions and Europe’s security.
The November 3 midterm elections have drastically changed the balance of power in Washington. Democrats will control both the House of Representatives and the Senate, following an electoral backlash driven partly by high living costs, the war with Iran and concerns over corruption.
The new Congress, taking office on January 3, 2027, will be able to investigate the administration, challenge spending priorities and block legislation and appointments. But Trump retains substantial executive authority over diplomacy and national security. His veto power and the Senate’s legislative rules will also limit the Democrats’ ability to reverse existing policies.
Four developments deserve particular attention: the administration’s next decisions on Iran, the stability of the EU-US trade agreement, congressional support for Ukraine and NATO, and the direction of US-China economic competition. The Democratic victory has weakened Trump’s domestic political position without removing his capacity to act internationally. The question for Europe is whether a politically weakened Trump becomes more restrained internationally – or relies even more heavily on executive powers to advance his agenda.
Mild first reactions on the markets
Financial markets responded cautiously to the Democratic sweep on November 4, initially reducing exposure to US equities and the dollar while seeking safety in gold and government bonds.
The dollar index fell as much as 0.6% to a one-month low, while the euro gained 0.6% to approximately 1.126 dollars. Gold rose 2.4% to around 4,022 dollars an ounce, and US Treasury yields declined as investors anticipated greater political gridlock and potentially less fiscal stimulus.
US stock futures initially dropped sharply before recovering much of their losses. Nasdaq futures, down more than 2% at one stage, later traded approximately 0.25% lower. Japan’s Nikkei lost 1.4%, while Hong Kong and mainland Chinese equities advanced. European stock futures also indicated modest losses early in the session.
Investors were particularly concerned that stronger Democratic oversight could restrict the expansion of artificial intelligence and data-centre infrastructure.
These early movements suggest an initial reassessment of American political risk, rather than a definitive judgment on the economic consequences of the election.
Iran: A possible turning point in the war
The conflict with Iran could become the first major confrontation between the incoming Congress and the White House.
The US-Israeli military campaign launched in February has disrupted regional security and global energy flows. Subsequent ceasefire arrangements and diplomatic initiatives have failed to produce a lasting settlement.
Democratic control of Congress could increase pressure for a negotiated exit, through investigations, scrutiny of military expenditure and attempts to restrict additional funding. Yet congressional opposition cannot automatically end military operations.
Two scenarios remain plausible. Stronger domestic political pressure could encourage Trump to accelerate negotiations. Alternatively, confrontation with Congress could strengthen his determination to demonstrate authority through foreign policy.
For Europe, the difference is substantial: reduced tensions could ease pressure on energy and shipping markets, while renewed escalation could prolong disruptions and inflationary risks.
Trade wars: Can Europe expect a reset?
The Democratic victory could constrain Trump’s ability to launch further trade confrontations, but it does not guarantee a return to the transatlantic relationship that preceded his presidency.
The EU-US trade framework, which entered into force in July 2026, established a 15% tariff ceiling for most European exports. Congressional scrutiny may help preserve greater predictability, although the president retains important trade-policy instruments.
The outlook for China is different. Competition over semiconductors, critical minerals, manufacturing capacity and advanced technologies enjoys substantial bipartisan support.
Democrats may favor a more coordinated approach with European allies, but the strategic objective of reducing dependence on China is unlikely to disappear.
For European industry, including Romania’s manufacturing and energy sectors, the key issue is whether Washington’s trade policies become more predictable without imposing additional costs on global supply chains.
NATO and Ukraine: More support, but not full reassurance
A Democratic Congress could reinforce American support for Ukraine, NATO and European security through defense budgets, legislative initiatives and more aggressive oversight of the administration’s relationship with Russia.
However, Congress cannot determine every aspect of American foreign policy. Trump will continue to influence military deployments, diplomatic negotiations and the credibility of US commitments.
For Romania, congressional support would be particularly relevant to NATO’s eastern flank, Black Sea security and the future of assistance to Ukraine.
The election may strengthen institutional safeguards around transatlantic cooperation, but it does not eliminate uncertainty over Washington’s strategic priorities. Europe’s case for increasing its own defense capabilities remains unchanged.
Impact on the global energy prices
The market reaction and especially the energy prices remain linked to developments in American foreign policy. Three mechanisms will matter in the months ahead.
The Iran conflict A credible settlement could reduce the geopolitical risk premium embedded in oil and LNG prices, particularly if maritime traffic through the Strait of Hormuz normalizes. Renewed military operations or attacks on infrastructure could have the opposite effect.
Russia and Ukraine American decisions concerning sanctions, negotiations and support for Kyiv could affect Russian energy exports, European supply security and global oil and gas trade flows.
For energy-importing economies, for Romania, too, lower geopolitical risk could ease inflationary pressure and improve industrial competitiveness. But actual supply disruptions, diplomatic outcomes, demand and weather conditions will remain decisive.
US-China trade relations. Greater policy predictability could support global economic activity and energy demand, while renewed tariff escalation could weaken industrial growth and commodity consumption.