The United States is heading into a crucial midterm election, with millions of voters expected to determine which political party will control Congress for the remainder of President Donald Trump’s current term.

The elections come after an intense campaign season, with Democrats hoping to overturn the Republican Party’s control of both the Senate and the House of Representatives.

The outcome is expected to have significant implications for Trump’s administration, particularly on its ability to advance legislation and implement its policy agenda.

Republicans currently hold majorities in both chambers of Congress, but Democrats are seeking to secure enough seats to regain control and increase their influence over federal decision-making.

The final day of campaigning has seen political parties make their last appeals to voters as candidates across the country intensify efforts to secure support ahead of the polls.

Meanwhile, the US Supreme Court has rejected Trump’s attempt to block thousands of ballots cast in California over claims that some may have been issued to people who are not American citizens.

The legal challenge added another dimension to the election campaign, with voting procedures and ballot eligibility remaining among the issues attracting attention ahead of the vote.

Millions of Americans have already participated in early voting, with Georgia recording a new midterm early-voting record.

According to figures released ahead of election day, approximately one-third of registered voters in the state had already cast their ballots, highlighting the significant participation recorded before the official polling day.

The high early-voting numbers have drawn attention to the level of voter engagement in key states, where congressional contests could play an important role in determining the balance of power in Washington.

BBC North America correspondent Anthony Zurcher reported that the Democratic Party was entering the elections with high expectations.

However, uncertainty remains over whether opinion polls have accurately captured the political mood among American voters.

Polling figures have been closely followed throughout the campaign, although the actual results will ultimately determine whether Democrats can translate their expectations into seats in Congress.

The midterm elections are particularly important because they take place halfway through a president’s four-year term and often influence the direction of the administration’s remaining years in office.

For Trump, retaining Republican control of Congress would allow his party to continue supporting his legislative priorities.

A Democratic victory in either chamber, meanwhile, could introduce greater scrutiny of the administration and complicate efforts to pass legislation.

With the country preparing to vote, attention is now shifting to the results and whether the balance of power in Congress will change.