The 90-minute debate quickly descended into chaos after Trump began to interrupt both Biden and the moderator, Fox News' Chris Wallace. The night didn't get much calmer from there.
Read highlights from Tuesday's debate below:
Fact-check: Biden says 1 in 1,000 Black Americans have been killed by coronavirus
Biden claimed earlier in the evening that "1 in 1,000 African Americans" have "been killed because of the coronavirus" and that "if he [Trump] doesn't do something quickly, by the end of the year, 1 in 500 will have been killed."
There is no question that Black Americans have been more severely affected by Covid-19 than whites — even the administration's public health agency agrees that Black Americans are disproportionately affected. A number of analyses and studies show that people of color in America have been hit harder by the coronavirus and are more likely to know someone who has died from it.
Biden appears to be referring a recent study from APM Research Lab found that the Covid-19 death rate for Blacks is 1 in 1,020 (97.9 deaths per 100,000). The report notes that "if they had died of COVID-19 at the same actual rate as White Americans, about 20,800 Black, 10,900 Latino, 700 Indigenous, and 80 Pacific Islander Americans would still be alive."
But the study doesn't address how the disparity in death rates will change by the end of the year. NBC News has reached out to the Biden campaign for additional information.
Fact-check: Did Trump suggest nuking a hurricane? He called that report 'fake news'
Biden said that the president of the United States said he wanted to "drop a nuclear weapon" on hurricanes. Trump retorted, "I never said that."
Here's what Biden was referring to: On Aug. 25, 2019, Axios reported that Trump had suggested "multiple times" that the U.S. should explore the use of nuclear bombs to combat hurricanes.
According to Axios: "During one hurricane briefing at the White House, Trump said, 'I got it. I got it. Why don't we nuke them?' according to one source who was there. 'They start forming off the coast of Africa, as they're moving across the Atlantic, we drop a bomb inside the eye of the hurricane and it disrupts it. Why can't we do that?' the source added, paraphrasing the president's remarks."
A senior administration official did not deny the exchange, telling the publication: "His goal — to keep a catastrophic hurricane from hitting the mainland — is not bad. ... His objective is not bad."
But Trump wrote in a tweet at the time that the report was "just more fake news."
Here’s how the two men who helped Trump prepare for the debate felt about his performance
Rudy Giuliani and Chris Christie, the two men Trump said helped him prepare for this debate, were asked how they thought the president performed.
"The problems the president had tonight can potentially be fixed," Christie said on ABC News.
Meanwhile, on Twitter, Giuliani wrote: "If the crooked press is at all fair, Trump dominated this debate," adding that Trump showed that he was "vigorous" and "tough."
Harris denounces Trump's debate performance, says he 'debased' the presidency
Kamala Harris criticized Trump for his debate performance, focusing on the combative tone he struck throughout the 90-minute event.
"America was presented with a very clear choice," Harris, the Democratic vice presidential candidate, said in an interview with MSNBC, characterizing Trump's behavior as "angry" and "defensive."
Harris said Trump has "debased the office of the president of the United States."
"And that is our office. It's not his office," she added.
Harris will debate Vice President Mike Pence next week in Utah.
Fact-check: Did Kellyanne Conway say violence and chaos 'help [Trump's] cause?'
Trump disputed a broadside from Biden that Kellyanne Conway, Trump's former campaign manager and a top White House aide, said riots and chaos "help [Trump's] cause." But Conway did make comments along those lines in late August.
"His own former spokesperson said, you know, riots, chaos and violence help us and violence help his cause. That's what this is all about," Biden said.
After Trump questioned whom Biden was quoting, he responded, "Kellyanne Conway."
Trump replied: "I don't think she said that."
Here's the exact quote, via video of Conway's appearance on "Fox and Friends" on Aug. 27: "The more chaos and anarchy and vandalism and violence reigns, the better it is for the very clear choice on who's best on public safety and law and order."
Conway announced Aug. 23 that she would be leaving the White House at the end of the month.
Proud Boys celebrate after Trump's debate callout
The Proud Boys, a far-right extremist group, pledged allegiance to Trump on Tuesday night after he told the group to "stand back and stand by" during the evening's debate.
"Proud Boys, stand back and stand by, but I'll tell you what, somebody's got to do something about antifa and the left, because this is not a right-wing problem. This is a left-wing problem," Trump said after Biden asked him to denounce the group.
Many people on social media who identify with the group echoed that language, saying they were "standing down and standing by." A known social media account for the group made "Stand back. Stand by" part of its new logo.
On the Proud Boys' account on the social media app Telegram, the group also appeared to take the statement as marching orders.
"Standing down and standing by sir," the account wrote. The account then posted two videos of the answer, including one with the caption "God. Family. Brotherhood," in which a man howled at the TV in response to Trump's response.
Megan Squire, a computer science professor at Elon University in North Carolina who tracks online extremism, said Trump's giving the Proud Boys orders was their long-sought "fantasy."
Fact-check: Trump falsely accuses Obama of 'spying' on his 2016 campaign
Trump once again accused the Obama administration of spying on his campaign — a claim that Trump has made on numerous occasions and which remains false.
"When I listen to Joe talking about a transition, there's been no transition from when I won. I won if you look at that election and if you look at Crooked Hillary Clinton, if you look at all of the different people, there was no transition, because they came after me trying to do a coup, coming after me spying on my campaign," Trump said. "They started from the day I won and even before I won."
A review conducted by the Justice Department's own watchdog found in December that the investigation into Russian interference in the 2016 election — a probe that deeply touched the 2016 Trump campaign — was justified.
The 434-page report by Justice Department Inspector General Michael Horowitz raised questions about the FBI's use of confidential human sources to gather information from individual members of the Trump campaign. FBI officials said it was a normal investigative technique, but the inspector general questioned whether there should be special guidelines when it comes to political campaigns.
The report did, however, clearly refute the notion that the FBI placed a "spy" in the Trump campaign.
"We found no evidence," the report said, that the FBI sent any confidential sources to join the Trump campaign, sent them to campaign offices or events or tasked them to report on the Trump campaign.
The inspector general said he examined more than a million documents and interviewed more than 100 witnesses to reach the report's conclusions.
Fact-check: Trump overstates job gains made under his administration
Trump claimed that he had brought back 700,000 manufacturing jobs that were lost during the Obama administration because "they gave up."
"They said it would take a miracle to bring back manufacturing. I brought back 700,000 jobs. They brought back nothing. They gave up on manufacturing," Trump said.
Trump is overstating job gains made during his administration, according to federal employment data examining net job losses.
About 1.4 million manufacturing jobs were lost during the Obama administration's eight years, many of them during a major recession that President Barack Obama inherited when he took office, which hit the industry hard.
Under Trump, the U.S. gained about half a million manufacturing jobs from 2016 to 2019, according to federal employment data. But about 200,000 of the manufacturing jobs gained under Trump have since been lost during the coronavirus pandemic.
'Train wreck,' 'Dumpster fire': Journalists and pundits give blistering reactions to first debate
Journalists and pundits weighed in offering blistering assessments of the first Biden and Trump debate.
- Rachel Maddow (MSNBC): "This sort of debate should not happen in a democracy."
- Joy Reid (MSNBC) "This is not the night I expected." She called it "embarrassing."
- Nicolle Wallace MSNBC): A mess because of Trump's "desperate need for oxygen of air time," and he was an "abusive participant." "Chris Wallace did not act as a moderator. Trump did not act like a debater," Wallace said.
- Jake Tapper (CNN): "That was a hot mess inside a dumpster fire inside a train wreck."
- Chuck Todd (NBC News): "It was a train wreck, but it was a train wreck by one person."
- Dana Bash (CNN): "S---show."
Fact-check: Trump says poll watchers were 'thrown out' in Pennsylvania. What really happened?
Trump said his campaign's poll watchers were "thrown out" of voting sites in Philadelphia.
"Today, there was a big problem: In Philadelphia, they went in to watch, they were called poll watchers, a very safe, a very nice thing. They were thrown out. They weren't allowed to watch. You know why? Because bad things happen in Philadelphia," he said toward the end of the debate.
That's because the poll watchers weren't approved to be at that particular location.
A Philadelphia Inquirer reporter at a Board of Elections satellite office said Tuesday that a woman who said she was hired by the Trump campaign as a poll watcher wasn't allowed into the office.
But a spokesman for the city commissioner's office said that's because satellite voting officials don't qualify as voting places, so poll watchers can't be given poll watcher certificates to allow them to observe the process.
"The Satellite Offices are Board of Election Offices that provide voter services to residents of Philadelphia for registration, absentee, and mail-in ballots. Individuals are able to go to those offices for those types of services," said Nick Custodio, a Philadelphia deputy commissioner, told NBC News in a statement.
"The Satellite Offices are not Polling Places. Poll watcher certificates have not been issued for any individuals for anything other than poll watching activities on Election Day at Polling Places," the statement continued.
"Individuals who are not seeking to receive services from a Satellite Office are not permitted to be there for other purposes. This is particularly important in the current environment as City buildings and offices remain closed to the public due to COVID-19."
Ben Kamisar contributed.