US Senate race neck-and-neck as Trump readies presidential bid

WASHINGTON - President Joe Biden's Democrats edged closer to retaining control of the US Senate as Donald Trump prepared to declare his bid for the White House in 2024.

Democratic Senator Mark Kelly won re-election in Arizona, three television networks projected. His victory will give Democrats 49 Senate seats, one short of securing a majority, with Nevada still counting votes and Georgia's contest headed to a December 6 runoff.

Blake Masters, Kelly's Republican opponent in Arizona, did not immediately concede defeat, and late on Friday Trump claimed the result was "a scam and voter fraud".

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President Joe Biden phoned Kelly to congratulate him on his win, the White House said.

Trump will announce next week that he is taking another shot at the presidency in 2024, his longtime advisor Jason Miller said.

The divisive former president, who will be 78 when the next election is held, has been hinting at another presidential run while campaigning for Republican candidates ahead of this week's midterm elections, and said he will make a "very big announcement" on Tuesday.

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"President Trump is going to announce on Tuesday that he is running for president," Miller told former Trump aide Steve Bannon on his popular "War Room" podcast.

Trump's candidacy would be his third shot at the presidency, including his loss to Biden in 2020. After that defeat, he promoted baseless claims of fraud, including those that led to an unprecedented riot at the US Capitol in Washington.

Trump's big announcement in Florida will come after a disappointing run for several candidates he backed in the midterms, although more than 100 Republican candidates who challenged the 2020 presidential results still won their respective races.