A record 90 million Americans have voted early in the US presidential election, data on Saturday showed, as President Donald Trump and his Democratic rival Joe Biden campaigned across the country to try to sway the few remaining undecided voters.
The high number of early voters, about 65% of the total turnout in 2016, reflects intense interest in the contest, with three days of campaigning left.
Concerns about exposure to the coronavirus at busy Election Day voting places on Tuesday have also pushed up the numbers of people voting by mail or at early in-person polling sites.
Trump, a Republican, is spending the closing days of his re-election campaign criticizing public officials and medical professionals who are trying to combat the coronavirus pandemic even as it surges back across the United States.
Opinion polls show Trump trailing former Vice President Biden nationally, but with a closer contest in the most competitive states that will decide the election. Voters say the coronavirus is their top concern.
Trump has repeatedly claimed without evidence that mail-in ballots are susceptible to fraud and has more recently argued that only the results available on election night should count. In a flurry of legal motions, his campaign has sought to restrict absentee balloting.
"I don't care how hard Donald Trump tries. There's nothing - let me say that again - there's nothing that he can do to stop the people of this nation from voting in overwhelming numbers and taking back this democracy," Biden said at a rally in Flint, Michigan, where he was joined by former President Barack Obama for their first 2020 campaign event together.
Officials in several states, including Pennsylvania and Wisconsin, say it could take several days to count all of those mail ballots, meaning there could be days of uncertainty if the outcome hinges on those states.
At a small, in-person rally in Newtown, Pennsylvania, Trump mocked his opponent for his criticism of the administration's record of fighting COVID-19, which has killed more people in the United States than in any other country.
"I watched Joe Biden speak yesterday. All he talks about is COVID, COVID. He's got nothing else to say. COVID, COVID," Trump told the crowd, some of whom did not wear masks.
He said the United States was "just weeks away" from mass distribution of a safe vaccine against COVID-19, which is pushing hospitals to capacity and killing up to 1,000 people in the United States each day. Trump gave no details to back up his remarks about an imminent vaccine.
In his closing arguments, Biden has accused Trump of being a bully, criticized his lack of a strategy to control the pandemic, which has killed nearly 229,000 Americans; his efforts to repeal the Obamacare healthcare law; and his disregard for science on climate change.
He has offered his own made-in-America economic platform, a contrast with Trump's "America First" approach, saying he will get the wealthy to pay their fair share and make sure earnings are distributed more equitably.
Stanford University economists on Saturday released an estimate that Trump rallies held from June to September led to more than 30,000 additional COVID-19 infections and possibly as many as 700 deaths. The study was based on a statistical model and not actual investigations of coronavirus cases. The paper, which did not cite disease experts among its authors, has not been peer-reviewed.
Public health officials have repeatedly warned that Trump campaign events could hasten the spread of the virus, particularly those held in places where infection rates were already on the rise. Determining the actual impact of those rallies on infection rates has been difficult due to the lack of robust contact tracing in many U.S. states.
Amesh Adalja, an infectious diseases expert at the Johns Hopkins Center for Health Security, described the report as "suggestive."
"I would just say it's suggestive but hard to completely isolate the specific impact of one event without robust contact trace data from the cases," Adalja said.
Biden's campaign, which has sharply limited crowd sizes at events or restricted supporters to their cars, quickly seized on the Stanford findings.
"Trump doesn't even care about the very lives of his strongest supporters," Biden campaign spokesman Andrew Bates said in a statement. Trump's campaign did not immediately respond to a request for comment on the report.
On Saturday, Trump was focused on campaigning in Pennsylvania, with a total of four rallies planned.
"If we win Pennsylvania, it's over," Trump said during his second rally of the day, in Reading.
The state has not as yet seen the dramatic rises in coronavirus cases that are threatening hospital capacity in Wisconsin and other battleground states. Still, nearly 8,700 people in the state have died of the disease.