Adding to those calls, The New York Times urged the president to quit the race to give another candidate a better chance at defeating Trump.
“Mr Biden has been an admirable president,” the newspaper said in a piece by its editorial board.
“But the greatest public service Mr Biden can now perform is to announce that he will not continue to run for re-election.”
It added: “As it stands, the president is engaged in a reckless gamble. There are Democratic leaders better equipped to present clear, compelling and energetic alternatives to a second Trump presidency.
“There is no reason for the party to risk the stability and security of the country by forcing voters to choose between Mr Trump’s deficiencies and those of Mr Biden.”
More on Joe Biden
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‘I can do this job’
Mr Biden has tried to quell anxieties since his performance. At a rally in North Carolina, he appeared to acknowledge the criticism, but struck a defiant tone.
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“I don’t walk as easy as I used to, I don’t speak as smoothly as I used to, I don’t debate as well as I used to, but I know what I do know,” said Mr Biden. “I know how to tell the truth.”
“I give you my word as a Biden, I wouldn’t be running again if I did not believe, with all my heart and soul, I can do this job,” he told the rally.
Mr Biden attacked the former president’s criminal record, calling Trump a “one-man crimewave”.
“My guess is he set a new record for the most lies told in a single debate,” he added, telling the crowd he spent “90 minutes on the stage debating a guy with the morals of an alley cat”.
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0:44
‘Biden, you are fired’
Hours later, Donald Trump was jubilant at a rally in Chesapeake, Virginia.
“Never mind that crooked Joe Biden spent a week at Camp David, resting, working, studying – he studied so hard he didn’t know what the hell he was doing,” Mr Trump told the crowd.
“Biden’s problem is not his age, […] he’s got no problem other than his competence. He’s grossly incompetent,” he added.
Bad debate nights happen
Barack Obama tweeted his support for President Biden on Friday evening, saying: “Bad debate nights happen. Trust me, I know.”
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Joe Biden had a cold and sore throat during last night’s debate, the White House said.
But others remained unconvinced he should run for president.
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0:12
Joe Biden appears to stall during debate
“I do not think President Joe Biden can be the Democratic Party’s standard-bearer in 2024,” former White House director of global engagement Brett Bruen told Sky News’ Yalda Hakim.
“Last night’s performance was astonishingly bad. You cannot just be strong on the teleprompter,” he said.
But Anthony Scaramucci, former White House communications director, blamed the president’s poor performance on his preparation.
“He wasn’t prepped right for that debate. He’s an older man,” Mr Scaramucci told Yalda Hakim.
“You don’t fill his head with facts and figures he’s never going to remember.”
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0:58
Biden v Trump: What you need to know
There have been repeated calls for President Biden to step down.
It’s “time to talk about an open convention and a new Democratic nominee,” one Democratic politician told Sky’s US partner network NBC News.
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1:32
Kamala Harris says Biden had a ‘slow start’ but he ‘pushed facts’ while Donald Trump ‘pushed lies’.
However, while Vice President Kamala Harris acknowledged that President Joe Biden had a “slow start” in the debate, she insisted that he finished “strong”.
President Biden’s campaign spokesperson said there are no conversations taking place about the president stepping aside from his re-election bid.
He also still plans to take part in the next debate against Donald Trump, which is slated for 10 September, said the spokesperson. They added that last night’s debate has not changed the campaign strategy.
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At a Waffle House restaurant in Atlanta after the debate, Biden told reporters he did not have concerns about his performance. “It’s hard to debate a liar,” he said.
A body has been recovered from a South African mine after police cut off basic supplies in an effort to force around 4,000 illegal miners to resurface.
The body has emerged from the closed gold mine in the northwest town of Stilfontein a day after South Africa’s government said it would not help the illegal miners.
Around 20 people have surfaced from the mineshaft this week as police wait nearby to arrest all those appearing from underground.
It comes a day after a cabinet minister said the government was trying to “smoke them [the miners] out”.
The move is part of the police’s “Close the Hole” operation, whereby officers cut off supplies of food, water and other basic necessities to get those who have entered illegally to come out.
Local reports suggest the supply routes were cut off at the mine around two months ago, with relatives of the miners seen in the area as the stand-off continues.
A decomposed body was brought up on Thursday, with pathologists on the scene, police spokesperson Athlenda Mathe said.
It comes after South African cabinet minister Khumbudzo Ntshavheni told reporters on Wednesday that the government would not send any help to the illegal miners, known in the country as zama zamas, because they are involved in a criminal act.
“We are not sending help to criminals. We are going to smoke them out. They will come out. Criminals are not to be helped; criminals are to be prosecuted. We didn’t send them there,” Ms Ntshavheni said.
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Senior police and defence officials are expected to visit the area on Friday to “reinforce the government’s commitment to bringing this operation to a safe and lawful conclusion”, according to a media advisory from the police.
In the last few weeks, over 1,000 miners have surfaced at various mines in South Africa’s North West province, where police have cut off supplies.
Many of the miners were reported to be weak, hungry and sickly after going for weeks without basic supplies.
Illegal mining remains common in South Africa’s old gold-mining areas, with miners going into closed shafts to dig for any possible remaining deposits.
The illegal miners are often from neighbouring countries, and police say the illegal operations involve larger syndicates that employ the miners.
Their presence in closed mines has also created problems with nearby communities, which complain that the illegal miners commit crimes ranging from robberies to rape.
Illegal mining groups are known to be heavily armed and disputes between rival groups sometimes result in fatal confrontations.
In the courtyard of a farmhouse now home to soldiers of the Ukrainian army’s 47th mechanised brigade, I’m introduced to a weary-looking unit by their commander Captain Oleksandr “Sasha” Shyrshyn.
We are about 10km from the border with Russia, and beyond it lies the Kursk region Ukraine invaded in the summer – and where this battalion is now fighting.
The 47th is a crack fighting assault unit.
They’ve been brought to this area from the fierce battles in the country’s eastern Donbas region to bolster Ukrainian forces already here.
Captain Shyrshyn explains that among the many shortages the military has to deal with, the lack of infantry is becoming a critical problem.
Sasha is just 30 years old, but he is worldly-wise. He used to run an organisation helping children in the country’s east before donning his uniform and going to war.
He is famous in Ukraine and is regarded as one of the country’s top field commanders, who isn’t afraid to express his views on the war and how it’s being waged.
His nom de guerre is ‘Genius’, a nickname given to him by his men.
‘Don’t worry, it’s not a minefield’
Sasha invited me to see one of the American Bradley fighting vehicles his unit uses.
We walk down a muddy lane before he says it’s best to go cross-country.
“We can go that way, don’t worry it’s not a minefield,” he jokes.
He leads us across a muddy field and into a forest where the vehicle is hidden from Russian surveillance drones that try to hunt both American vehicles and commanders.
Sasha shows me a picture of the house they had been staying in only days before – it was now completely destroyed after a missile strike.
Fortunately, neither he, nor any of his men, were there at the time.
“They target commanders,” he says with a smirk.
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It takes me a moment or two to realise we are only a few steps away from the Bradley, dug in and well hidden beneath the trees.
Sasha tells me the Bradley is the finest vehicle he has ever used.
A vehicle so good, he says, it’s keeping the Ukrainian army going in the face of Russia’s overwhelming numbers of soldiers.
He explains: “Almost all our work on the battlefield is cooperation infantry with the Bradley. So we use it for evacuations, for moving people from one place to another, as well as for fire-covering.
“This vehicle is very safe and has very good characteristics.”
Billions of dollars in military aid has been given to Ukraine by the United States, and this vehicle is one of the most valuable assets the US has provided.
Ukraine is running low on men to fight, and the weaponry it has is not enough, especially if it can’t fire long-range missiles into Russia itself – which it is currently not allowed to do.
Sasha says: “We have a lack of weapons, we have a lack of artillery, we have a lack of infantry, and as the world doesn’t care about justice, and they don’t want to finish the war by our win, they are afraid of Russia.
“I’m sorry but they’re scared, they’re scared, and it’s not the right way.”
Like pretty much everyone in Ukraine, Sasha is waiting to see what the US election result will mean for his country.
He is sceptical about a deal with Russia.
“Our enemy only understands the language of power. And you cannot finish the war in 24 hours, or during the year without hard decisions, without a fight, so it’s impossible. It’s just talking without results,” he tells me.
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These men expect the fierce battles inside Kursk to intensify in the coming days.
Indeed, alongside the main supply route into Kursk, workers are already building new defensive positions – unfurling miles of razor wire and digging bunkers for the Ukrainian army if it finds itself in retreat.
Sasha and his men are realistic about support fatigue from the outside world but will keep fighting to the last if they have to.
“I understand this is only our problem, it’s only our issue, and we have to fight this battle, like we have to defend ourselves, it’s our responsibility,” Sasha said.
But he points out everyone should realise just how critical this moment in time is.
“If we look at it widely, we have to understand that us losing will be not only our problem, but it will be for all the world.”
Stuart Ramsay reports from northeastern Ukraine with camera operator Toby Nash, and producers Dominique Van Heerden, Azad Safarov, and Nick Davenport.
The adverse weather could lead to total insured losses of more than €4bn (£3.33bn), according to credit rating agency Morningstar DBRS.
Much of the claims are expected to be covered by the Spanish government’s insurance pool, the agency said, but insurance premiums are likely to increase.