Democratic presidential nomineeJoe Biden said voters deserve to know his stance on Supreme Court packing before the election, while President Trump faced a grilling by NBC on the coronavirus, taxes and white supremacy in dueling town halls Thursday night. 

Biden, the former vice president, signaled at an ABC News town hall that he'd announce his stance on court-packing after the Senate votes on Trump's nomination of Amy Coney Barrett and before the Nov. 3 election.

The Democratic presidential nominee reiterated his position from the presidential primaries that “I have not been a fan of court packing"  but reversed course on his previously tight-lipped stance on whether he'd try to expand the number of justices on the court to combat a conservative majority.

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Voters “do have a right to know where I stand," Biden said.

Democratic presidential candidate former Vice President Joe Biden participates in a town hall with moderator ABC News anchor George Stephanopoulos at the National Constitution Center in Philadelphia, Thursday, Oct. 15, 2020. (AP Photo/Carolyn Kaster)

Democratic presidential candidate former Vice President Joe Biden participates in a town hall with moderator ABC News anchor George Stephanopoulos at the National Constitution Center in Philadelphia, Thursday, Oct. 15, 2020. (AP Photo/Carolyn Kaster)

Meanwhile on NBC News, Trump faced tough questioning on issues such as whether he has a replacement for Obamacare, his handling of the coronavirus and a potential peaceful transfer of power.

"Will you accept the results of the election?" NBC News' Savannah Guthrie asked Trump. "You're own FBI director says there is no evidence of voter fraud."

"Then he's not doing his job," Trump said  But "the answer is yes, I will."

Guthrie brought up a New York Times story about Trump's taxes that said he only paid $750 in taxes in both 2016 and 2017 and that he holds $421 million in loans and debts. 

"Who do you owe $421 million to?"

"It's a tiny percentage of my net worth," Trump replied.

Meanwhile, on ABC, Biden said he doesn't support a ban on fracking or defunding the police and he doesn't see a need for another coronavirus lockdown.

But he said it's "absolutely" OK to raise taxes on wealthy Americans and corporations during a weak economy because his economic plan would spur growth and create jobs. He stressed that he would only repeal the Trump tax cuts on the highest income earners.

"About $1.3 trillion of the $2 trillion in [Trump's] tax cuts went to the top one-tenth of 1 percent," Biden said. "That's what I'm talking about eliminating, not all the tax cuts that are out there."

In one exchange, a young Black man asked Biden about his comments to Charlamagne tha God that "you ain't Black" if you don't vote for him. 

"Besides 'you ain't Black' what do you have to say to young black voters who see voting for you as further participation in a system that continually fails to not protect them?" the audience member asked. 

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Biden encouraged the young man to vote and then offered a long-winded response on his record on criminal justice reform, education and entrepreneurship that host George Stephanopoulos had to cut off.

"Did you hear what you needed to hear?" Stephanopoulos asked the young man.

"I think so," he replied.

Then Biden chimed in again and started talking about a story of his dad losing his job in Scranton.

"If you're going to hang out afterwards I'll tell you more," Biden told him as Stephanopoulos tried to move on to the next questioner. 

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The Trump town hall was shorter than Biden's but doubly more combative.

Trump kicked off the combative tone with a tweet announcing his town hall with "fake" NBC News and questioning whether he would be treated as well as "Sleepy Joe." 

The town hall started off with a 20-minute grilling by Guthrie on coronavirus, QAnon and white supremacy before getting to audience questions. 

Guthrie asked Trump on why he was hesitant to denounce white supremacy during the first presidential debate and Trump complained that NBC won't ask Biden if he denounces Antifa and said the former vice president is treated like "a child" by the press.

"Are you listening? I denounce white supremacy," Trump told Guthrie. "What’s your next question?" 

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"It feels sometimes you’re hesitant to do so," Guthrie responded.

"Hesitant? Here we go again," Trump lamented.

President Donald Trump speaks during an NBC News Town Hall, at Perez Art Museum Miami, Thursday, Oct. 15, 2020, in Miami. (AP Photo/Evan Vucci)

President Donald Trump speaks during an NBC News Town Hall, at Perez Art Museum Miami, Thursday, Oct. 15, 2020, in Miami. (AP Photo/Evan Vucci)

In contrast, the Biden town hall was a more cordial affair. Neither Stephanopoulos nor the audience members asked Biden anything about his son, Hunter, and the bombshell New York Post reporting on emails that purport to link him to Hunter's business dealings in Ukraine. 

The event ended with Stephanopoulos thanking Biden and audience members for asking good questions. "I think you did a service to our democracy tonight," the news anchor said. 

The competing town halls were the fallout of a scrapped second debate that was long scheduled for Thursday night. Trump's coronavirus diagnosis and the outbreak at the White House prompted the Commission on Presidential Debates to cancel an in-person event in favor of a virtual format.

But the Trump campaign wasn't on board with an online format and the Biden campaign didn't agree to a date change, so the debate eventually was canceled altogether. 

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The second debate was already marred by controversy when the scheduled moderator, C-SPAN's Steve Scully, admitted he lied that his Twitter account was hacked after a message to a former Trump aide-turned-adversary Anthony Scaramucci emerged before the now-canceled event.

As of now, the final in-person debate between Trump and Biden is still set for Oct. 22 in Nashville.

"I expect to be there," Biden said, while making a point on the importance of testing. 

Trump was pressed on whether he tested negative for coronavirus before the initial presidential debate between the two on Sept. 29, a requirement of the debate commission. The White House hasn't been clear on Trump's testing schedule before his infection was made public on Oct. 2 and Trump was cagey on whether he was tested on the day of the debate.

"It was afterwards," Trump said. "I don't know, I don't even remember. I test all the time but I can tell you this, after the debate, like I guess a day or so, I think it was Thursday evening, maybe even late Thursday evening, I tested positive. That's when I first found out about it."

In one moment of levity at the Trump event, one woman questioner gushed about Trump's looks.

"Good evening, Mr. President. I have to say you have a great smile,” Paulette Dale said, beaming with a big grin.

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“You’re so handsome when you smile,” she added. 

Trump thanked Dale and the audience applauded the sign of affection. 

Fox News' Caitlin McFall, Brian Flood, Paul Steinhauser and Brooke Singman contributed to this report.