When Biden heads to Michigan Saturday, he will also reunite with former President Barack Obama -- the first time the pair will appear together in the 2020 race.

“On Saturday, October 31, President Obama will join Joe Biden in Michigan to discuss bringing Americans together to address the crises facing the country and win the battle for the soul of the nation,” the Biden campaign advised.

Obama has held three solo appearances over the past week campaigning for his former vice president in the battleground states of Florida and Pennsylvania, excoriating Trump's leadership and praising Biden's preparedness in his remarks.

-ABC News’ Molly Nagle

Biden early votes in Wilmington, expands on health care plan

The former vice president and former second lady Jill Biden early voted in Wilmington, Delaware, this afternoon, and sported masks and “I Voted” stickers when walking out of their polling location. 

On the heels of his remarks on health care, Biden was asked by reporters what he’s learned from the Affordable Care Act when prepping his own health care bill to be ready to send to Congress if elected president. Biden said he has a bill ready and and would work with Republicans.

“And yes, I do have a proposal that relates to how we can improve the Affordable Care Act, beyond what before was before, which Barack and I wanted to do at the time to add a public option, allowing people to keep their private insurance if that's what they choose that they want to do, making it more affordable to get a better plan,” Biden said, adding he believes he can get Republican support for his plan. 

Pressed on why he believes he could gain bipartisan support for the effort, Biden said public support for the bill would push Republicans over the line and earn their votes.

Announcing earlier in remarks that he would be voting today, Biden reminded Americans there are candidates and issues down the ballot that deserve voters’ attention, beyond the presidential race.

“There's a lot of people on that ballot -- not just me but the down ballot as well -- that are going to change things for us, make it better,” Biden said. 
 
-ABC News’ Molly Nagle and and Beatrice Peterson

In the final days of campaigning Biden is keeping his focus on the nation’s response to the coronavirus pandemic and the looming threat to the Affordable Care Act as the Supreme Court is scheduled to hear oral arguments to determine its fate one week after Election Day.

Biden delivered remarks this afternoon from The Queen Theater in Wilmington, Delaware, on his plans to combat COVID-19 and protect preexisting conditions following a virtual briefing with health experts on the “third wave” of the public health crisis.

Biden took a swipe at Trump’s Omaha rally after hundreds of the president's supporters were stranded Tuesday night for hours in near-freezing weather, waiting for buses to return them from Eppley Airfield hanger to their cars, resulting in some requiring medical attention and being taken to the hospital.

“It's an image that captures President Trump's whole approach to this crisis," Biden said. “He makes a lot of big pronouncements, but they don't hold up. He gets his photo op then he gets out. He leaves everyone else to suffer the consequences of his failure to make a responsible plan.”

Biden also railed about the fact that Republicans are seeking to dismantle the Affordable Care Act, which includes protections for preexisting conditions, amid the pandemic -- characterizing Justice Amy Coney Barrett’s swift confirmation while Americans were already voting in the 2020 election as a “craven abuse of political power.”

“So let's remember exactly what's at stake in this election. If you have diabetes, asthma, cancer or even complications from COVID-19, you're going to lose the protection this law provides,” Biden said.

Biden also acknowledged the pandemic will not be gone even if he’s elected but said he won’t be guided by “wishful thinking” but reason and facts.

Biden is headed to early vote in Wilmington.

Ahead of the vice president's trips to two battleground states Trump narrowly won in 2016, Pence's office announced he tested negative for the coronavirus again today -- as the Trump administration struggles with voter trust on its handling of the pandemic.

Pence will continue traversing the country as an "essential worker," according to the White House, despite five of his aides testing positive for COVID-19 over the weekend and Pence coming into close contact with at least one of those infected individuals. He has rallies this afternoon in Wisconsin and Michigan -- states where Biden leads Trump among likely voters, according to new ABC News/Washington Post polls.

Trump campaign national press secretary Hogan Gidley appearing on CNN this morning said that it wasn't a concern for the vice president to go to Wisconsin -- which had a record number of hospitalizations on Monday -- since his doctors have cleared him for travel.

"The vice president has the best doctors in the world around him. They're obviously contact traced and have come to the conclusion it's fine for him to be out on the campaign trail," Gidley said. "The American people have the right under the First Amendment to peaceably assemble, too."

Trump held a rally with hundreds of supporters in Bullhead City, Arizona, this afternoon as coronavirus cases in the state surge and the situation begins to resemble the early stages of the summer spike that made Arizona one of the worst hot spots in the world.

“You are so lucky, people, that I took you on this journey with me,” Trump told the enthusiastic crowd, aiming to pitch himself both to Arizona voters and Nevadans just across the Colorado River.

At one point, Trump defended what he called his "reputation" for stiffing people, saying people who do a “lousy job” don’t deserve to be paid -- using whoever set up his microphone at the rally as an example.

“Whoever did this microphone, don't pay them. You know, I have a reputation for not paying. And it's a false reputation. When somebody does a lousy job like a microphone that is no good or like teleprompters that fly with the wind, I say don't pay them,” Trump said.

Sen. Kamala Harris is also campaigning in the Cooper State this afternoon, opting for drive-in style rallies and roundtable events, as opposed to the shoulder-to-shoulder events the Trump campaign has hosted. In a parking lot at Pima Community College earlier in the day, Harris pushed back on Trump calling her a “female socialist.”

“You know there has been some talk about my values. Let me just tell you, Tucson, I am a proud patriotic American. I love my country and our values reflect the values of America,” Harris said.

-ABC News’ Averi Harper