Republicans are widely favoured to pick up the five seats they need to take over the House from Democrats, but control of the Senate could come down to tight races in Pennsylvania, Nevada, Georgia and Arizona.
US voters head to the polls to render a verdict on Joe Biden at the halfway point of his presidency.
US President Biden's unpopularity is helping drive the view that Republicans will win control of the US House of Representatives and possibly the US Senate as well on Tuesday.
A massive 40 million Americans have already voted early, according to reports and both sides were predicting victory.
President Biden and ex-leader Trump push Pennsylvania Senate candidates ahead of midterms on November 8, an election Biden says marks a "defining" moment for US democracy.
US President Biden, battling to show restive voters he has boosted the economy, touts his economic policies, and Donald Trump sends his strongest signal so far that he's planning a comeback.
President Biden begins his three-day election tour from New Mexico and will travel to California, Chicago and Pennsylvania, while ex-US leader Trump is hitting four key electoral states in five days.
US President Biden warns in final days of midterm election voting that democracy itself is under threat from ex-president Donald Trump's election-denying lies and violence he said they inspire.
In Florida state for a final push before November 8 midterms, US President Biden seeks to portray Republican Party as a threat to American middle-class households and seniors.
Ex-US president Donald Trump links to a report on an obscure right-wing website suggesting hundreds of thousands of mail-in ballots in Pennsylvania could be tainted by fraud.
President Joe Biden — accompanied by one of his granddaughters, a first-time voter — casts his midterm ballot in his home state of Delaware.
Observers warn of "chaotic election season" as campaigners, including ex-Trump aide Steve Bannon, promote "election denialism" and misinformation to entice thousands of Americans to sign up as observers and challengers for midterms.
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