Biden responded to concerns that another shutdown could harm the economy, already hurting from closures caused by the pandemic.

"I'm going to shut down the virus, not the country," he said. "It's his ineptitude that caused the virus -- caused the country to have to shut down in large part. Why businesses have gone under, why schools are closed, why so many people have lost their living and why they're concerned."

After attacking Trump for golfing during the pandemic, Biden said he hadn't ruled out additional shutdowns if necessary.

"You need standards," he said. "The standard is if you have a reproduction rate in a community that's above a certain level, everybody says slow up. More social distancing. Do not open bars and do not open gymnasiums."

In rebuttal, Trump criticized Democratic governors in several states for shutting down in response to the pandemic.

"They're shut down so tight and they're dying," he said. "They're dying. And he supports all these people. All he talks about is shutdowns. No, we're not going to shut down. And we have to open our schools."

In an example of how young people have better outcomes with coronavirus, the president mentioned his son Baron who tested positive.

"By the time I spoke to the doctor the second time, he was fine. It just went away. Young people -- I guess it's their immune system," he said.

Trump and Biden have contradictory views on the president's handling of the pandemic with Trump asserting he's done better than any other world leader and Biden claiming he's done "virtually nothing."

Trump's insisted again that the pandemic is "going away," touting his administration's efforts on therapeutics and vaccines.

"I don't think we're gonna have a dark winter at all," Trump said. "I say we're learning to live with it. We have no choice. We can't lock ourselves up in a basement like Joe does," drawing a laugh from Biden.

Biden emphasized the lives already lost, making a direct appeal to those at home.

"Number one, he says that we're, you know, we're learning to live with it. People are learning to die with it," Biden said. "You folks home who have an empty chair at the kitchen table this morning, that man or wife going to bed tonight and reaching over to try to touch their -- out of habit where their wife or husband was is gone. Learning to live with it? Come on."

When Trump threatened that Biden would shutdown the country if elected, causing massive economic depression, Biden said, "I'm going to shut down the virus, not the country."

In response to a question on how he would lead the country out of the crisis caused by the COVID-19 pandemic, Biden cited the more than 220,000 Americans who had died from the virus.

"Anyone who's responsible for that many deaths should not remain as president of the United States of America," he said.

Biden went on to say that Trump doesn't have a plan for dealing with the virus. He called for mask wearing, and a national policy on mask wearing, more testing and a national policy on reopening schools and businesses.

"I will take care of this. I will end this," Biden said to close out his first answer. "I will make sure we have a plan."

Trump tackled the first question on the coronavirus pandemic but stuck to his stance the pandemic is "rounding the corner" and "going away."

"Since the two of you last shared a stage, 16,000 Americans have died from COVID," Welker said. "So please be specific, how would you lead the country during this next stage of the coronavirus crisis?"

"As you know, 2.2 million people modelled out were expected to die," Trump began. "We closed up the greatest economy in the world in order to fight this horrible disease that came from China."

He went on to draw from his personal experience contracting COVID-19, downplaying its side effects and touting the country's therapeutics.

"I can tell you from personal experience that I was in the hospital. I had it. And I got better," Trump said. "And I will tell you that I had something that they gave me, a therapeutic, I guess they would call it, some people could say it was a cure. But I was in for a short period of time and I got better very fast or I wouldn't be here tonight. And now they say I'm immune. Whether it's four months or a lifetime, nobody has been able to say that, but I'm immune."

"It will go away and as I say, we're rounding the turn. We're rounding the corner. It's going away," he added.

The final topic of the night was climate change with Welker first asking each candidate how he would combat climate change and support job growth at the same time as president. Trump answered first.

"So we have the trillion trees program. We have so many different programs. I do love the environment, but what I want is the cleanest, crystal clear water, the cleanest air," Trump said, taking credit for the country's reduced carbon emission last year.

He went on to slam other counties air-quality and tout the U.S. by comparison.

"Look at China, how filthy it is. Look at Russia. Look at India. It's filthy. The air is filthy. The Paris Accord, I took us out because we were going to have to spend trillions of dollars, and we were treated very unfairly," Trump said, closing his two minutes by saying his administration has done an incredible job "environmentally."

When it was Biden's turn, he pivoted to the existential threat he says global warming poses to humanity and said the U.S. has a moral obligation to "deal with it" -- but said climate change also creates a prime opportunity for new jobs.

"Here's where we have a great opportunity. I was able to get both all the environmental organizations as well as labor, the people worried about jobs, to support my climate plan. Because what it does -- it will create millions of new good-paying jobs," Biden said. "Wall Street firms indicated that my plan -- my plan will, in fact, create 18.6 million jobs, 7 million more than his. This is from Wall Street. And I'll create $1 trillion more in economic growth than his proposal does. Not on climate, just on the economy."

Trump slammed Biden's response, claiming the former vice president's plan would cause a massive economic depression and deeming it a "pipe dream," before raising Biden's stance on fracking.

In the face of Trump's criticisms, Welker asked Biden directly, "Would you rule out banning fracking?"

"I do rule out banning fracking," Biden said. "We need other industries to transition to get to ultimately a complete zero emissions by 2025. What I will do with fracking over time is make sure we can capture the emissions from the fracking, capture the emissions from gas. We can do that and we can do that by investing money. It's a transition to that."

"Excuse me," Trump interrupted. "He was against fracking. He said it. I will show that to you tomorrow."

"Fracking on federal land, I said," Biden responded. "No fracking and/or oil on federal land."