A record of more than 95 million people have cast early ballots
US President Donald Trump hunts for support in four battleground states on Monday while Democratic rival Joe Biden focuses on Pennsylvania and Ohio during the final day of campaigning in their race for the White House.
The Republican Trump trails Biden in national opinion polls ahead of Tuesday's Election Day. But the race in swing states is seen as close enough that Trump could still piece together the 270 votes needed to prevail in the state-by-state Electoral College that determines the winner.
Trump, aiming to avoid becoming the first incumbent president to lose re-election since fellow Republican George H W Bush in 1992, will hold five rallies on Monday in North Carolina, Pennsylvania, Wisconsin and Michigan.
He won those states in 2016 against Democrat Hillary Clinton, but polls show Biden is threatening to recapture all four for Democrats.
In a year that has seen much of American life upended by the coronavirus pandemic, early voting has surged to levels never before seen in US elections. A record-setting 95 million early votes have been cast either in-person or by mail, according to the US Elections Project, representing about 40% of all Americans who are legally eligible to vote.
Trump will wrap up his campaign in Grand Rapids, Michigan, the same place he concluded his 2016 presidential run with a post-midnight rally on Election Day.
Biden, running mate Kamala Harris and their spouses will spend most of Monday in Pennsylvania, splitting up to hit all four corners of a state that has become vital to the former vice president's hopes.
Biden will rally union members and African-American voters in the Pittsburgh area before being joined for an evening drive-in rally in Pittsburgh by singer Lady Gaga.
He also will make a detour to bordering Ohio, spending time on his final campaign day in a state that was once considered a lock for Trump, who won it in 2016, but where polls now show a close contest.
Former President Barack Obama, whom Biden served as vice president for eight years, will hold a get-out-the-vote rally in Atlanta on Monday before closing out the campaign in the evening with a rally in Miami.
Biden has wrapped up the campaign on the offensive, traveling almost exclusively to states that Trump won in 2016 and criticizing the president's response to the coronavirus pandemic, which has dominated the race.
Biden accuses Trump of giving up on fighting the pandemic, which has killed more than 230,000 Americans and cost millions of jobs. Polls show Americans trust Biden more than Trump to fight the virus.
During a frantic five-state swing on Sunday, Trump - who was impeached by the Democratic-led House of Representatives last December and acquitted by the Republican-controlled Senate in February - claimed he had momentum.
He promised an economic revival and imminent delivery of a vaccine to fight the pandemic.
Dr Anthony Fauci, the top US infectious diseases expert, has said the first doses of an effective coronavirus vaccine will likely become available to some high-risk Americans in late December or early January.
Trump, who has often disagreed with Fauci publicly, suggested early on Monday he might fire him as director of the National Institute of Allergy and Infectious Diseases after the election.