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Election 2020 updates: Obama, Biden finish day of campaigning in Detroit

More than 91 million people have cast their ballots -- an early voting record.

Last Updated: November 1, 2020, 11:19 AM EST

With three days until Election Day, and President Donald Trump and former Vice President Joe Biden racing toward Nov. 3, more than 91 million Americans have already cast their ballots -- an early voting record.

On Saturday, Biden's top surrogate, former President Barack Obama, is joining him for the first time on the trail with drive-in rallies in Flint and Detroit.

Trump has four rallies in Pennsylvania as both candidates plan to "barnstorm" the state they deem critical in the final days before the election with the contest overshadowed by coronavirus cases rising there and in nearly every battleground territory.

Vice President Mike Pence has a pair of rallies in North Carolina -- a state Trump won by four points in 2016. California Sen. Kamala Harris is campaigning in Florida as Democrats vie for the state's 29 electoral votes key to Trump's pathway to the White House.

Top stories:

Here is how the day is developing. All times Eastern.
Oct 31, 2020, 6:29 PM EDT

Who Trump is courting in Pennsylvania on Saturday

President Trump's Pennsylvania rally blitz on Saturday is primarily taking him to GOP strongholds to excite supporters and activate Republicans who may not have voted four years ago -- a bid to supercharge Election Day turnout to offset any Democratic gains in the suburbs.

Stop 1: Bucks County 

President Donald Trump leaves after speaking at a campaign rally at Keith House, Washington's Headquarters in Newtown, Pa., Oct. 31, 2020.
Alex Brandon/AP

Bucks County is 25 miles north of Philadelphia and the fourth-most-populous county in the state. It's Trump's only stop on Saturday to an area that isn't reliably Republican. While it's gone blue in every presidential election since 2000, the margin has tightened in recent years. Hillary Clinton won Bucks County by fewer than 3,000 votes in 2016. Demographically, Bucks County is 88.1% white, with 40.5% of residents holding bachelor's degrees or higher, according to the 2019 census. 

Stop 2: Berks County
Trump stopped next in Reading, the seat of Berks County and the fifth-largest city in Pennsylvania. Berks County came close to flipping for former President Barack Obama in 2012, where he lost by under 2,000 votes. Trump closed that gap four years ago, seizing the lion's share of the vote by 18,000. Demographically, Berks County is a little more diverse than Bucks. The census estimates that as of 2019, 86.9% of Berks County residents identified as white and 22.5% identified as Latino -- compared to 5.7% in Bucks County. Only about 24.5% of Berks County residents hold degrees.

Stop 3: Butler County 
Trump will travel next to Butler County in western Pennsylvania, another Republican stronghold since 2000. He handily trounced Clinton here in 2016, receiving more than 61,000 votes compared to Clinton's 26,834. According to The Associated Press, more than 10,000 Republicans in the county did not vote in 2016. Butler County is overwhelmingly white, according to census estimates (95.8%), and only 35.4% of residents hold bachelor's degrees or higher.     

Stop 4: Lycoming County
The final stop will be Montoursville in Lycoming County -- yet another GOP area that has not been hotly contested to as far back as 2000. 

Bonus: Luzerne County
First lady Melania Trump was also heading to Wapwallopen in Luzerne County this evening -- one of three "pivot" counties that went for Trump four years ago after backing Obama twice. 

-ABC News' Benjamin Siegel

Oct 31, 2020, 3:41 PM EDT

Biden tests negative for COVID-19 Saturday

Former Vice President Joe Biden tested negative for COVID-19 on Saturday, according to the pool.

This was his 18th negative test announced since Trump's positive diagnosis earlier this month.

Former U.S. President Barack Obama and Democratic presidential nominee Joe Biden wave to the crowd at the end of a drive-in campaign rally at Northwestern High School in Flint, Mich., Oct. 31, 2020.
Drew Angerer/Getty Images

-ABC News' John Verhovek

Oct 31, 2020, 3:06 PM EDT

Obama joins Biden, slams Trump's COVID-19 response

Former President Barack Obama and Vice President Joe Biden are campaigning in Detroit and Flint, Michigan, Saturday in their first in-person appearance together on the 2020 campaign trail. 

Former US President Barack Obama joins Democratic presidential candidate Joe Biden at a campaign event in Flint, Mich., Oct. 31, 2020.
Jim Watson/AFP via Getty Images

At the first event in Flint, Obama removed his “VOTE” mask to tell the drive-in crowd, “this Tuesday, everything is on the line.”

Former President Barack Obama speaks at a rally for Democratic presidential candidate former Vice President Joe Biden, at Northwestern High School in Flint, Mich., Oct. 31, 2020.
Andrew Harnik/AP

“Our jobs are on the line, our health care is on the line,” Obama said.

Obama bashed President Trump's response to the pandemic, saying, "If Trump were focused on COVID from the beginning, cases wouldn't be reaching new record highs."

"Trump cares about feeding his ego," the former president said.

Supporters at a rally with Democratic presidential candidate former Vice President Joe Biden and former President Barack Obama at Northwestern High School in Flint, Mich.,Oct. 31, 2020.
Andrew Harnik/AP

Supporters line a road leading to a rally for Democratic presidential candidate former Vice President Joe Biden and former President Barack Obama at Northwestern High School in Flint, Mich., Oct. 31, 2020.
Andrew Harnik/AP

"Joe's not going to call scientists idiots," Obama said. "He's not going to host super-spreader events."

"Tweeting at the TV doesn't fix things," Obama said, but "Biden has concrete plans."

"Joe's plan will guarantee paid sick leave for workers and parents affected by the pandemic. He'll make sure the small businesses in every community ... can reopen safely," he said.

Biden then joined Obama, telling the crowd, "It's time for Donald Trump to pack his bags and go home. We're done with the chaos ... the failure, the refusal to take any responsibility."

Former US President Barack Obama introduces Democratic presidential candidate Joe Biden at a campaign event in Flint, Mich., Oct. 31, 2020.
Jim Watson/AFP via Getty Images

"Imagine where we'd be if we had a president who wore a mask instead of mocking it," Biden said.

Both Detroit and Flint are Democratic strongholds. But in 2016, declines among some of the Democrats’ core constituencies helped Trump win Michigan by under 11,000 votes. 

Hillary Clinton won both Wayne and Genesee counties, home to Detroit and Flint, but her margins were significantly less than Obama in 2012. 

-ABC News' Kendall Karson

Oct 31, 2020, 2:51 PM EDT

Melania Trump on COVID-19: US has 'made great progress'

First Lady Melania Trump made a campaign visit to Wisconsin Saturday, stressing that the pandemic “is not a partisan issue” and claiming “the Democrats want to project feelings of fear and doubt, purely for political reasons."

First Lady Melania Trump greets supporters during a campaign rally at Kingsheart Farm in West Bend, Wisc., Oct. 31, 2020.
Andrew Caballero-Reynolds/AFP via Getty Images

As the U.S. reaches its highest number of daily coronavirus cases, the first lady said, “We have made great progress in our fight against COVID-19… When COVID-19 invaded our country, we first had to learn what it was, how it spreads and how to prevent it.”

“Joe Biden said this will be a dark winter … his solution is to move backwards and to shut things down,” she said. “When my husband talks about the future, it is filled with continued possibility and forward thinking.”