US midterm elections 2026: What's at stake for Trump, his opponents and 2028 White House race

The November 3 US midterm elections will determine whether Donald Trump continues to rule the US a Congress largely aligned with his agenda, or faces two years of heated resistance from an opposition empowered to challenge each and every decision of his.

With all 435 seats in the House of Representatives and 35 of the Senate’s 100 seats up for election, the results will shape the balance of power in Washington, influence key policy decisions and set the stage for the 2028 presidential contest.

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Republicans currently control both chambers of Congress, giving the president a legislative advantage. Democrats are seeking to break that hold and turn Congress into a check on executive power. The outcome will decide not only the administration’s ability to advance its priorities but also the extent of congressional oversight during the remainder of Trump’s term.

What are midterm elections and why do they matter?

US presidents and vice-presidents are elected every four years. Midterm elections take place halfway through that period, when voters elect members of Congress and several state-level officeholders, but not the president or vice-president.

Unlike presidential elections, which use the Electoral College to determine the winner, midterms decide the composition of Congress. Historically, the president’s party tends to lose congressional seats in these elections, reflecting voter approval or dissatisfaction with the administration. This trend is not inevitable, but it makes the midterms a crucial test of a president’s political standing.

The newly elected 120th Congress will convene in January 2027. Its composition will determine how much legislative support Trump retains for the final two years of his presidency.

House of Representatives: A narrow path to control

The House is expected to be the most closely contested battleground. A September 2026 analysis by the European Parliament’s research service put the Republican strength at 219 seats against 214 for Democrats, with two vacancies. Reuters reported on October 12 that Democrats would need a net gain of four seats to secure a majority.

Although the numerical gap is small, the contest will depend on individual districts with different political preferences, local concerns and candidates. Congressional boundaries are another factor. Mid-decade redistricting, which allows states to redraw electoral maps between the usual ten-year census cycles, has altered the competitive landscape. Republican-led efforts in some states have created additional obstacles for Democrats, even as other districts remain susceptible to changing voter sentiment.

Races in Pennsylvania, Arizona, Michigan, North Carolina, Florida and Washington are among those to watch. Vulnerable Republican incumbents and open seats could prove decisive in determining which party controls the chamber.

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A Democratic victory would give the party the House leadership and greater scope to launch investigations, issue subpoenas and scrutinise the administration. Republicans, meanwhile, would retain an important legislative advantage if they hold their majority. Democrats do not need to win every competitive race; they need to gain enough seats while protecting their own vulnerable incumbents.

Senate: The battle over judges and appointments

The Senate presents a different challenge for Democrats because several Republican-held seats are in states that Trump won comfortably in 2024. Republicans currently have 53 seats, while Democrats and independents who caucus with them hold 47. Democrats need a net gain of four seats to reach a majority of 51. The vice-president can break a 50-50 tie, making the precise arithmetic dependent on the chamber’s composition and control of the vice-presidency.

According to Reuters’ October 12 assessment, key contests include Georgia, Michigan, New Hampshire, Maine, North Carolina, Ohio, Alaska, Iowa, Texas and Kansas.

In Alaska, Republican Senator Dan Sullivan faces former Democratic Representative Mary Peltola. Trump won the state by 13 percentage points in 2024, while its ranked-choice voting system adds uncertainty to the contest.

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Iowa has an open seat following Republican Senator Joni Ernst’s decision not to seek re-election. Republican Ashley Hinson and Democrat Josh Turek are competing for it, with economic concerns and the Iran war featuring in the debate.

Kansas is another race attracting attention. Republican Senator Roger Marshall faces Democrat Adam Hamilton, while immigration enforcement has become a point of disagreement within the Republican camp. The contest illustrates how national policy debates can complicate elections even in states that strongly backed Trump.

Control of the Senate has implications beyond legislation. The chamber confirms federal judges, Supreme Court nominees and senior executive appointments. A Republican majority would preserve the president’s ability to advance nominees with support from his party, subject to Senate rules and individual senators’ votes. Democratic control would give the opposition greater leverage over appointments and the legislative agenda, although it would not automatically enable the party to reverse every presidential policy.

Governor and state legislature elections

Voters will also elect governors in 36 states. The current national tally stands at 26 Republican governors and 24 Democratic governors. Of the governorships being contested, 18 are held by Republicans and 18 by Democrats.

Republicans are defending governorships in New Hampshire and Vermont, both states won by Kamala Harris in 2024. Democrats, meanwhile, are defending governorships in Arizona, Kansas, Michigan, Pennsylvania and Wisconsin, all won by Trump in 2024.

Governors influence state budgets, healthcare, education, public safety, energy development and the implementation of federal policies. They also play important roles in emergency management and the administration of elections under state law.

Several contests have particular national significance. In Georgia, Democrat Keisha Lance Bottoms faces Republican Rick Jackson in a race with implications for healthcare and data-centre regulation. The state remains politically important following disputes over the 2020 election.

In Ohio, Democrat Amy Acton and Republican Vivek Ramaswamy are competing for the governorship, which carries influence over state policy and election administration. Wisconsin’s contest between Democrat David Crowley and Republican Tom Tiffany is significant in a state that has repeatedly been closely divided in presidential elections. Nevada is also drawing national attention, with economic pressures and the cost of living central to its political debate.

These contests will reflect local candidates’ records and policy priorities as well as national political sentiment. State legislative elections are equally consequential because lawmakers determine whether governors’ proposals become law, shape abortion policy and establish election rules. Depending on state laws and the timing of redistricting, legislatures may also influence future congressional boundaries.

Which issues will determine the outcome?

The economy is the leading concern among voters, according to a Pew Research Center survey of registered voters conducted between September 28 and October 4. Some 84% rated it very important to their vote. The future of democracy, healthcare and education followed, while immigration and foreign policy also featured prominently.

Economy and cost of living

Inflation, housing, energy and everyday expenses are likely to influence how voters judge the party in power. Republicans will seek to persuade voters that the administration’s policies are delivering results and that continued congressional control is necessary to sustain them. Democrats will look to economic dissatisfaction to challenge the administration’s record on household finances.

The Iran conflict adds another dimension, with fuel prices and the war’s economic consequences becoming part of the political debate, including in traditionally Republican states. How voters connect these pressures with presidential policies could influence closely contested races.

Immigration and border enforcement

Immigration remains central to Trump’s political agenda, particularly his efforts to expand deportations and intensify enforcement. Republicans argue that stronger enforcement is necessary to control illegal immigration and protect national security. Democrats have challenged aspects of the administration’s approach, citing its effects on communities, workers and families.

Pew found that 72% of voters supporting Republican congressional candidates considered immigration very important, compared with 53% of those backing Democratic candidates. However, enforcement has also produced disagreements within Republican ranks over the extent of the administration’s actions.

Healthcare, education and abortion

Healthcare is a particularly important issue for Democratic voters. In the Pew survey, 82% of Democratic-candidate supporters rated it very important, against 53% of Republican-candidate supporters. The results could influence debates over healthcare funding, insurance coverage and federal policy.

Education is important to both parties, although they differ over school governance, curriculum and the role of government. Abortion remains politically significant following the Supreme Court’s 2022 decision overturning the constitutional protection previously recognised under Roe v. Wade. State governments now have greater authority over abortion policy, raising the stakes in gubernatorial and legislative contests.

Democracy, investigations and foreign policy

The future of democracy was rated very important by 73% of registered voters in Pew’s survey. The issue covers election administration, political accountability and confidence in democratic institutions.

Investigations into the Trump administration are another dividing line. Some 63% of Democratic-candidate supporters rated the issue very important, compared with 7% of Republican-candidate supporters.

Foreign policy, including the Iran war, tariffs and America’s international role, could also influence assessments of presidential leadership, security and economic priorities. The election will not determine the course of a conflict directly, but congressional control could alter the political constraints under which the administration operates.

How the midterms could shape 2028

The results will influence both parties’ strategies for the next presidential election. Retaining control of Congress would allow Republicans to argue that Trump has maintained political support during his second term. Losing either chamber would prompt questions about the administration’s economic record, political strategy and ability to mobilise voters beyond its core base.

For Democrats, capturing the House or Senate would provide a platform to challenge the president and raise the national profiles of emerging leaders. It could also sharpen internal debates over the party’s future direction and the balance between progressive candidates and more centrist figures.

The immediate contest is about control of Congress and state governments. Its wider significance lies in determining how much political room Trump has to govern, how effectively Democrats can challenge him and the conditions under which both parties will prepare for 2028.