Donald Trump, challenger Joe Biden and their top surrogates barreled through crucial states in the industrial Midwest and coastal southeast on Saturday, pressing closing arguments in a frantic sprint days ahead of the US presidential election.

Using some of his most urgent language yet, Trump warned of "bedlam in our country" if no clear winner emerges quickly in Tuesday's election, saying, without evidence, that it could take weeks to sort out a result and that "very bad things" could happen in the interim.

US Elections
US battleground states Photo: AFP / Sophie RAMIS

Biden meantime told backers it was "time for Donald Trump to pack his bags and go home."

Underscoring the high stakes -- and the disruptive impact of the coronavirus pandemic -- a record 90 million early votes have already been cast, as the bruising contest heads toward the biggest turnout in at least a century.

The virus has killed over 230,000 Americans, ravaged the world's largest economy and was infecting record numbers of people across the US.

President Donald Trump
President Donald Trump -- pictured at a rally in Tampa, Florida -- has stuck to his strategy of downplaying the danger of the coronavirus and calling for businesses to reopen Photo: AFP / Brendan Smialowski

The election takes place in a deeply divided country, with feelings so raw that gun sales have surged in some areas. Businesses in some cities, including Washington, are protectively boarding windows, and police are preparing for the possibility of violence.

Trump was focusing Saturday on the key battleground state of Pennsylvania -- "the state where the story of American independence began," he said in the small city of Newtown, the first of four stops in that state amid a frenetic final sprint.

Joe Biden
Joe Biden held a drive in rally with social distancing Photo: AFP / JIM WATSON

Biden made his first joint appearance of the campaign with his former boss Barack Obama -- probably the most popular Democrat in the country -- in Flint, Michigan as they scramble to boost turnout in a state Trump carried by a razor-thin margin in 2016.

Vice President Mike Pence was meanwhile campaigning in narrowly divided North Carolina as Biden's running mate Kamala Harris was in Florida, another vitally important swing state.

Joe Biden
Democratic presidential candidate Joe Biden and his rival President Donald Trump take their White House battle to the American Midwest just days before the November 3, 2020 election Photo: AFP / Jim WATSON

Pennsylvania has emerged as one of the top prizes this year.

In his motorcade en route to rural Bucks County, the president passed hundreds of supporters holding up a forest of pro-Trump signs. The crowd then booed trailing vehicles that were carrying reporters, a regular target of Trump's attacks.

US Presidential Elections
Americans, such as this voter in Pennsylvania, have been casting their ballots in record numbers ahead of the November 3, 2020 election Photo: AFP / Angela Weiss

Later in Butler, Pennsylvania, he arrived at the biggest rally of the day so far with well over 5,000 people crammed in -- few in masks but many wearing red Trump hats.

In remarks at an event in Bucks County, Trump lashed out at Biden, saying he would shut down the state's fossil-fuel industry.

US President Donald Trump
US President Donald Trump and his White House rival Joe Biden each rallied their supporters in Minnesota on October 30, 2020, just four days before the election Photo: AFP / MANDEL NGAN

The president claimed credit for creating the "greatest economy in the history of this country -- the history of the world" -- while "foreign nations are in freefall."

Despite recent signs of recovery from the virus-induced economic pain, however, millions remain jobless.

The campaign has been overshadowed by the surging pandemic, which had even sickened Trump and members of his staff.

US Presidential Elections
Overview of the US presidential election on November 3, including key proposals by Joe Biden and Donald Trump, and electoral college voting intentions by state as of Oct 30. Photo: AFP / Gal ROMA

More than 94,000 new infections were recorded Friday in the US -- another new high -- and total cases passed nine million, according to data from Johns Hopkins University.

In stark contrast to Trump, who has belittled mask-wearing by Biden and others, the Democrat has scrupulously followed the guidance of public health experts.

After Biden and Obama appeared Saturday before a socially distanced drive-in rally in Flint, they made an unannounced stop in suburban Bloomfield Hills before heading to Detroit, where they were joined by superstar singer Stevie Wonder.

Biden leads in the state by nearly seven points, according to a RealClearPolitics average of polls. The state's 16 electoral votes could provide a sizable leap towards the 270 needed to win the White House.

Trump, in eking out his 2016 victory, took advantage of low turnout rates among Michigan Blacks. As Biden campaigns with the nation's first Black president, he clearly hopes to change that.

Obama pulled few punches in Flint and Detroit, saying 140,000 American lives would have been saved if the president had taken an approach to the pandemic similar to Canada's.

"This is not a contest of just calling each other names," Obama said.

"This isn't a sporting event. This is life or death."

Biden said "we're done with the chaos, the tweets, the anger, the failure, the refusal to take any responsibility."

Biden's campaign announced he will address the nation on election night from his home base of Wilmington, after a vote that will undoubtedly leave millions bitterly disappointed, no matter who wins.

On Friday, the state reported a staggering nine million residents had already voted, surpassing its 2016 total.

Harris visited Texas Friday in a bid to turn the state Democratic for the first time since 1976.

But Trump is racing through an exhausting string of raucous rallies in the final days and is betting he can pull off another shock result -- like in 2016.

Trump "has done more for this country than any president," said Jeff Close, who attended the Trump rally in Reading, Pennsylvania.

"He's kept his word -- promises made, promises kept."

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