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

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."

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.”

Vice President Mike Pence jogged to the stage for his first rally of the day in Elm City, North Carolina, where he asked supporters to repeat the 2016 outcome and vote to reelect President Donald Trump.

Pence wore a mask before and after his remarks, only taking it off to speak. There were a few hundred supporters in attendance, but the majority were not wearing any face masks and were not social distancing.

Pence said that a COVID-19 vaccine is “just a short time away” and that nurses and doctors would have the supplies needed to continue treating patients as cases rise across the country.

Although Trump said the U.S. is "rounding the turn" Saturday, Pence admitted, "we continue to contend with this pandemic, we see cases rising in communities around the country."

“We are just a short time away, before the end of this year, of having the first safe coronavirus vaccine, and tens of millions of doses for the American people," Pence said. "We’re gonna continue to move heaven and Earth to make sure that our doctors and nurses have all the supplies and resources they need."

-ABC News' Justin Gomez

When vice presidential candidate Sen. Kamala Harris spoke to supporters in Miami on Saturday, she was interrupted by a male protester who shouted pro-Trump and anti-Biden slogans.

Biden supporters tried to intervene by putting Biden signs in the protester's face. The protester was escorted out by security. 

Amid the disruption, Harris urged those in the audience not to be distracted. 

“We're not gonna be distracted by what's at hand," Harris said, as the crowd cheered. "We're not gonna be distracted by the stakes.... We know what we have to do."

"You gotta ask, why are these powerful people trying to make it so difficult for us to vote?" she said.

Harris also has stops in Fort Lauderdale and Lake Worth, Florida, Saturday.

-ABC News' Averi Harper

At the first of his four Saturday rallies in the battleground state of Pennsylvania, President Donald Trump told the crowd, "this is the state that will save the American dream."

"A great red wave ... is forming," Trump said in Bucks County. "And there's not a thing they can do about it."

When Trump brought up Democratic nominee Joe Biden, some in the crowd yelled "lock him up!"

"I fought harder for you than any president," Trump said.

"Nobody has done in three-and-a-half years, nobody, no administration, no president what we've done and what we've accomplished... Nobody even challenges that," Trump said, without mentioning the coronavirus pandemic.

Trump, in a calm, subdued, voice, continued, "Do not be intimidated by our opponent's angry and menacing tone. Because if we were, we would never have been able to accomplish what we've accomplished. In truth, they are actually terrified of you, the people.

Trump later mentioned COVID-19, saying "we're rounding the turn," even though the U.S. on Friday set a new daily case record for the second straight day.

The Bucks County rally was held outside but social distancing was not enforced. Many were seen without masks.

In 2016, Trump narrowly won Pennsylvania by 44,000 votes – less than 1% of the total ballots cast in the state.