At his stop in St. Paul, Minnesota, former Vice President Joe Biden battled with noise from Trump supporters as he took aim at the president.

Talking over a constant stream of air horns and beeps, the Democratic nominee responded to President Donald Trump's claim at a rally earlier Friday that doctors inflate the number of deaths from COVID-19 to get more money.

"The president of the United States is accusing the medical profession of making up COVID deaths so they make more money," Biden said. "Doctors and nurses go to work every day to save lives. They do their jobs. Donald Trump should stop attacking them and do his job."

Biden addressed the noise three times during his remarks. At one point, he referred to those "ugly folks" blasting horns and attempting to interrupt the event.

"Dr. [Anthony] Fauci called for a mask mandate last week. This isn't a political statement like those ugly folks over there beeping the horns," Biden said. "This is a patriotic duty, for God's sake. Look, in his own words, as I said, the president knew back in January how extremely dangerous and communicable this disease was."

Biden pleaded with voters to keep themselves engaged in the final four days of the race -- once again taking a jab at the loud protesters as he did so.

"Right here in Minnesota, with all of you, in the final days, keep that sense of empowerment. Keep that -- empowerment with you, that sense of optimism, of what we can overcome," he said. "Now look, there's a reason they don't want to hear me, because they know the president doesn't say anything. So they're not used to not hearing anything."

Toward the end of his remarks, Biden pointed to a recent appellate court ruling that absentee ballots received after Election Day cannot be counted, and urged everyone to hand-deliver their ballot rather than mail it.

"So if you want your voice to be heard, drop off your ballot. Don't put it in the mail. Or vote safely in person any day up through Election Day," he said. "But you've got to get it done. And make sure everyone you know votes as well, so they'll not be able to stop us."

-ABC News' Molly Nagle

At his second rally of the day, President Donald Trump spoke to supporters on a chilly day in Green Bay, Wisconsin.

As he has at every rally recently, the president attempted to downplay the threat of COVID-19 and said the U.S. is "rounding the turn" on the pandemic, despite the country facing a third wave of cases and hospitalizations surging around the country.

Coronavirus cases, hospitalizations and deaths are particularly on the rise in Wisconsin. On Friday, the state reported more than 5,000 new cases, and almost every county is experiencing "very high disease activity," including Brown County, where Green Bay sits, state health department data shows.

Wisconsin Gov. Tony Evers has called the surge an "urgent crisis" and has asked people to stay home.

While in Wisconsin, Trump made it very clear that if "we win this state ... it's over."

He also continued to blast this week's ABC News/Washington Post poll, which found him down 17 points to Biden among likely voters in Wisconsin.

"I said, wait a minute, I just left a crowd of 25,000 people or more," said Trump, referring to a rally earlier this week in West Salem. "They were going crazy. That wasn't a second-place crowd. You know, we know a second-place crowd. That was not a second-place crowd."

-ABC News' Terrence Smith, Elizabeth Thomas and Will Steakin

At his first of two stops in Arizona on Friday, Vice President Mike Pence threw his support behind congressional candidates and told Arizonans to elect them so House Speaker Nancy Pelosi, D-Calif., can be removed from her post.

"So right after you reelect President Donald Trump for four more years and right after you reelect Sen. Martha McSally to the United States Senate, we all need you to send Paul Gosar, Congressman Markwayne Mullin and Tiffany Shedd to a new Republican majority in the House of Representatives, and retire Nancy Pelosi once and for all. Out! She has got to go," Pence said at the outdoor rally in Flagstaff.

That caused some supporters to chant "lock her up!"

Mullin, it should be noted, is not on the ballot in Arizona, but represents Oklahoma's 2nd Congressional District.

McSally, who is competing in one of the most-watched Senate campaigns this cycle, introduced Pence. The vice president said it was "an honor" to share the stage with her, and that she has "emerged as one of the greatest champions" for Republicans.

On the coronavirus, Pence said that a vaccine is "just a short time away." He acknowledged that COVID-19 cases are increasing in the state, which reported 1,565 new cases Friday.

"And as we see cases rise, particularly across the heartland and even somewhat here in Arizona," he told of the crowd of about 500, the majority of whom were not wearing masks or social distancing. "I want to assure you, we're going to continue to move heaven and earth to make sure that our doctors and nurses, and here in Arizona and everywhere in America, that every family has access to the health care that we'd want any member of our family to have."  

-ABC News' Justin Gomez

With only four days until Nov. 3, Texas has moved this week in Biden's favor -- shifting from lean Republican to a toss-up, according to ABC's race ratings.

Here's where the race to 270 currently stands: Biden - 290; Trump - 125; Toss-up -123.

Click here for ABC's interactive electoral map, which is updated weekly.

-ABC News' Kendall Karson

Heading into the final weekend before Election Day, both candidates are doing a final blitz through the battleground states they hope will determine the outcome of the race in their favor -- but the barnstorming comes as coronavirus cases rise in every competitive state they’re vying for.

Friday brings the candidates to Minnesota and Wisconsin -- revealing the importance both campaigns are placing on those states. Trump also stops in Michigan -- where Biden will campaign on Saturday with former President Barack Obama -- and Biden will also take to Iowa -- a state he hasn’t seen since the Iowa caucuses and one that Trump took in 2016 by nearly 10 points.

Trump’s and Biden’s campaign events in the homestretch have also illustrated their different outlooks on the coronavirus pandemic, with Trump insisting to packed crowds of mostly maskless supporters that the virus is disappearing, while Biden has acknowledged the pandemic will continue even if he’s elected and has repeatedly thanked his supporters for wearing masks and social distancing at his drive-in rallies. 

But Trump’s rally in Minnesota this afternoon may change that trend and force the president to face the realities of the pandemic.

In the first time the campaign has limited attendance at a rally in accordance with local COVID-19 guidelines, the Trump campaign will allow just the first 250 people in line to attend Trump's rally in Rochester, Minnesota, due to restrictions by the governor to control the virus, which the campaign called "free speech-stifling."

The weekend blitz comes after the candidates converged in Florida Thursday to court the Latino vote and in which each offered conflicting realities of COVID-19 at their dueling rallies down the I-4 corridor. The weather threw both of them curve balls by the evening with Biden’s second Florida rally being cut short due to rain and Trump’s North Carolina rally also scrapped due to weather.

The vice president and vice-presidential candidate, too, are out of the trail with Republicans on offense -- defending the map that led them to victory in 2016 -- and Democrats seeking to expand theirs.

California Sen. Kamala Harris travels in Texas as Democrats play offense and sense an opportunity to snatch the GOP-stronghold for the first time in more than four decades. Vice President Mike Pence, meanwhile, has two rallies in Arizona -- a state Trump won in 2016 by four points.

With just four days to go and more than 82 million votes already cast, time is running out for Trump and Biden to sway voters.