The US President Donald Trump’s policies on Iran, trade and immigration helped trigger a sweeping Republican defeat in Tuesday’s elections, as rising living costs, the prolonged war against Iran and the administration’s mass deportation campaign fueled widespread voter anger across the United States.
The Republican Party lost control of both chambers of Congress in what has been described as a “Blue Tsunami,” with voters expressing strong opposition to the economic and political consequences of Trump’s second-term agenda.
The scale of the Republican losses has been widely viewed as a rejection of Trump’s two years in the White House, with economic pressures and the consequences of Washington’s military decisions increasingly dominating voters’ concerns.
Rising prices proved one of the most immediate sources of public anger. Across the United States, households struggled with the growing cost of essential goods, fuel and energy. Prices increased by 3.7% in the year to September, while average retail diesel prices in early October approached the record of $6.52 per gallon recorded in September.
“Gas prices, grocery prices, everything’s going up,” one North Carolina voter told the BBC, explaining that she had switched her support from Republicans to Democrats.
According to voter polling, 79% of respondents said inflation had caused their families moderate or severe financial hardship over the previous year, while more than six in 10 blamed Trump’s policies for unusually high prices.
The economic pressure has been compounded by the US-Israeli war against Iran, launched in February, which has driven up global energy costs following Tehran’s effective closure of the strategically important Strait of Hormuz in retaliation.
The disruption to a major international route for oil and liquefied natural gas shipments has pushed fuel prices higher, leaving American consumers to bear the financial consequences of a military aggression that has proved unpopular across the country.
Around 63% of voters said the United States had made the wrong decision in taking military action against Iran, while 74% identified the conflict as a major or crucial factor in their congressional vote.
The war also exposed divisions within Trump’s political base, particularly among supporters of his America First agenda, which had promised to avoid further military conflicts.
Trump acknowledged the morning after the election that the war on Iran had contributed to the Republican defeat, although he insisted on his baseless claims in an interview with Fox News that military intervention had been necessary to prevent Iran from obtaining a nuclear weapon.
Meanwhile, Democratic candidates capitalized on public dissatisfaction by focusing their campaigns on healthcare affordability, living costs and corruption.
In Michigan, Abdul El-Sayed campaigned on getting “money out of politics, money in your pocket”, while Democratic Senator Jon Ossoff secured re-election in Georgia by making economic pressures and corruption central campaign issues.
In Texas and Kansas, former teacher James Talarico and pastor Adam Hamilton also gained support through campaigns addressing voters’ concerns, while former pediatrician Annie Andrews secured an upset victory in South Carolina by focusing on healthcare affordability.
Trump’s declining popularity further weakened Republican candidates, including in states that supported him in 2024.
His decision to make himself the central figure in the Republican campaign appeared to backfire as voters increasingly demanded answers about inflation and the administration’s priorities. In his final campaign speech in Washington, he devoted considerable attention to his controversial renovation project at the Reflecting Pool rather than concentrating on the economic concerns dominating the election.
The Republican losses also reflected a significant shift among Hispanic and black voters, reversing gains Trump had made among these communities in the 2024 presidential election.
Democrats won all three House races in predominantly Hispanic congressional districts along the Texas-Mexico border. Majority-Hispanic counties shifted more than 22 percentage points against Republican Senate candidates compared with the previous presidential election, according to a New York Times analysis.
Growing opposition to immigration enforcement was another factor, with 56% of Americans expressing an unfavorable opinion of Immigration and Customs Enforcement (ICE), according to the Pew Research Center.
Counties with black majorities also moved significantly toward Democratic Senate candidates, with Mississippi’s closely contested race potentially marking a historic breakthrough for Democrats in a state where they have not won a Senate election since 1982.