By Ali Zeraatpisheh

The November 3, 2026 midterm elections dealt a major blow to President Donald Trump and the Republican Party, with Democrats winning control of both chambers of Congress.

The result marked a sharp rejection of the Republican administration less than two years into Trump’s second term.

Voters turned against a presidency increasingly defined by economic pressure, political controversy and an escalating war against Iran.

The war became a particularly damaging issue because its consequences extended beyond the battlefield, with higher fuel prices adding to the financial pressures American households faced.

The political cost was acknowledged from within the administration itself: Vice President JD Vance declared, “The reason we lost is the war.” At the same time, Trump conceded that the US-Israeli military aggression and rising gasoline prices had hurt Republican candidates in the elections.

Although soaring inflation, the cost of living crisis and dissatisfaction with the administration also shaped the outcome, the unprovoked and illegal war on Iran emerged as a central factor in the Republican defeat.

How did the war on Iran become an electoral liability for Trump?

The scale of public opposition to the war was evident in post-election surveys, which showed that a majority of American voters rejected the decision to launch the aggression against Iran and that this opposition translated into strong support for Democratic candidates.

According to the AP Voter Poll, which surveyed more than 100,000 voters nationwide, roughly six in ten considered the US decision to go to war with Iran wrong, and most of those voters supported Democratic candidates in their local House races. Conversely, nearly all voters who backed Democratic House candidates viewed the war as the wrong decision.

The ABC News Voter Poll found that 34 percent of House voters considered the Iran war a crucial factor in their congressional vote, a significant share even though it ranked below government corruption, at 55 percent, and the cost of living, at 49 percent.

The findings indicate that the war was not the only reason for the Republican defeat, but it became a major dividing line between voters who rejected Trump's policies and those who continued to support them.

A separate Fox News-NORC survey of approximately 3,000 registered voters, conducted from November 1 to 3, further exposed the political weakness of the administration's justification for the war, with around six in ten respondents saying the United States had made the wrong decision to use military force against Iran.

More than two-thirds also considered avoiding a prolonged war very important, while nearly twice as many preferred ending US military involvement to reduce gasoline prices.

These findings suggest that Trump's decision to attack Iran alienated voters not only because of opposition to another US military adventure in West Asia, but also because many Americans saw little justification for prolonging a war that was imposing economic costs at home.

Where did Republicans lose ground due to aggression against Iran?

The Republican defeat extended far beyond traditionally competitive states, exposing a nationwide erosion of support that reached areas Trump had carried comfortably in the 2024 presidential election.

Reuters analysis of results from approximately 2,100 counties found that Republicans lost ground in 99 percent of them, with their vote share falling by an average of nine percentage points compared with Trump's 2024 performance.

The most striking reversals came in states long considered Republican strongholds. Texas elected Democrat James Talarico to the Senate by more than 10 percentage points, marking the first Democratic Senate victory in the state since 1988.

Kansas elected a Democratic senator for the first time in 94 years. In South Carolina, Democrats also defeated Trump's hand-picked Senate candidate, despite the president having carried the state by nearly 18 points in 2024.

The shift was particularly pronounced among Hispanic voters, a group that had moved toward Trump in 2024.

Reuters found that across 64 majority-Hispanic counties with Senate races, the Republican share of the vote was 14 percentage points lower than Trump's share in those areas two years earlier

Young voters also moved decisively away from Republicans. According to the AP Voter Poll, approximately seven in ten voters under 30 supported Democratic candidates in their local House races, compared with a roughly even split between Trump and Kamala Harris among young voters in 2024.

Republicans also lost ground among Black voters, particularly Black men: only about one in ten supported Republican House candidates, down from roughly one in four who voted for Trump in 2024.

These results showed that Trump's electoral coalition had weakened across several groups that had helped return him to the White House.

Democratic gains in Republican strongholds demonstrated that the backlash was not confined to traditional Democratic constituencies.

The scale of the shift made the Republican losses a national repudiation of the administration’s decision to go to war with Iran rather than a setback limited to a handful of competitive races.

How far did the Democratic wave extend beyond Congress?

The Republican defeat was not confined to the loss of congressional control, as Democrats also made major gains in state-level elections, weakening the GOP's influence across the country and delivering another setback to Trump's political agenda.

Democrats captured at least 28 governorships for 2027, securing a majority of governors' offices for the first time in two decades, after winning traditionally Republican states including Texas, Georgia, Iowa and Ohio.

The party also swept the executive offices in all six states that decided the 2024 presidential election: Arizona, Georgia, Michigan, Nevada, Pennsylvania and Wisconsin.

These victories gave Democrats greater influence over state policies and strengthened their ability to challenge federal actions by the Trump administration, including its immigration operations, federal funding conditions and efforts to expand federal authority over elections.

Republicans also suffered setbacks in state ballot initiatives. In Missouri, voters rejected a Republican-backed congressional map promoted by Trump.

Across more than three dozen states, voters decided 145 ballot measures, reflecting the breadth of the political contest beyond the federal races.

What can Democrats actually do to stop the Iran war?

Democratic control of Congress gives the party several constitutional and legislative tools to challenge Trump's military policy.

The incoming Congress, which convenes on January 3, 2027, will have authority over federal spending, the power to investigate the administration and the ability to scrutinize the officials responsible for directing the war.

One of the first major confrontations could come before Democrats even take control. The temporary measure funding the federal government is due to expire on December 11, allowing lawmakers to demand restrictions on the use of federal money for war against Iran.

The annual National Defense Authorization Act, which sets policy and authorizes funding for the Pentagon, offers another potential battleground: The 2027 legislation is expected to authorize approximately $1.15 trillion in national defense spending, and Democrats could seek to attach conditions restricting the administration's military actions.

Democrats could also revive efforts to invoke the War Powers Resolution, which gives Congress a mechanism to challenge military operations that have not received congressional authorization.

The Senate has already voted 14 times on the Iran war, although the only measure approved by both chambers was a nonbinding resolution calling on Trump to end the aggression.

The Senate majority will also give Democrats control over confirmation votes for senior administration officials, ambassadors and other diplomatic and national security nominees.

They can delay or reject appointments, use confirmation hearings to question officials about the war and demand explanations for military decisions.

Meanwhile, committees in both chambers can investigate Pentagon spending, military contracts, the administration's justification for the war and its financial consequences, using subpoenas to compel testimony and obtain documents.

The election has therefore created an opportunity for Democrats to challenge the war through funding restrictions, investigations and legislative pressure.

The central test will be whether the new majority uses its control of Congress to impose meaningful limits on Trump's military decisions or confines itself to hearings and political criticism while the war continues.