Here's some more detail from what Donald Trump said in a video he posted from hospital in the past hour.

"I think I'll be back soon," the president said, adding "I look forward to finishing up the [election] campaign the way it was started." He suggested he was committed to fighting coronavirus worldwide.

He said he was "so thankful" to those who sent him good wishes in the US and also to world leaders who sent condolences.

He also said the first lady is "doing very well", pointing out that his wife is younger than him and therefore in a lower-risk category than the president, who is 74.

"I think we're going to have a very good result, over the next few days we're going to know for sure. I want to thank everybody out there, the outpouring of love has been incredible," he added.

In a video posted on social media in the last half an hour, Donald Trump has thanked healthcare workers for attending to him and said the next few days will be the "real test" for him.

"I came here, wasn't feeling so well, I feel much better now. They're working hard to get me all the way back," he said, sitting behind an office desk. The president was taken to the Walter Reed hospital on Friday.

Image source, Reuters

Presidential candidate Joe Biden has said he was not tested again for coronavirus on Saturday but he will be on Sunday, a journalist with the New York Times newspaper has tweeted. Biden was answering journalists' questions as he left mass in Delaware.

He tested negative twice on Friday, five days after sharing a stage with Donald Trump at the presidential debate in Cleveland, Ohio.

The two candidates stood at a distance at podiums on opposite sides of the stage. They did not shake hands and everyone attending - including the 80 or so audience members - was tested before the event and were asked to wear masks throughout.

However, members of Trump's family did not wear masks during part of the event, and were pictured disembarking from Trump's plane to Cleveland without face coverings.

Image source, Reuters

Donald Trump has clear risk factors - including his age, weight and being male - that all raise the chances of a severe coronavirus infection.

He is 74 and has a Body Mass Index (BMI) over 30, which is the clinical definition of obesity.

The problem is that it is dangerous to speculate about how the virus will affect any individual person.

Everything you have read is the big picture - a pattern seen across the whole population - it is not a way of saying this is what will happen to the US president.

Read more here

US Vice President Mike Pence tweeted earlier today in support of Mr and Mrs Trump.

"Grateful to God and the incredible medical team caring for our friends. Keep those prayers coming America!" he wrote.

Mr Pence and his wife Jane have both tested negative for the coronavirus.

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One of Trump's close allies and a campaign advisor, Chris Christie, has tweeted he has gone into hospital in New Jersey as a "precautionary measure".

On Saturday the former New Jersey governor became the latest to say he tested positive for coronavirus.

Christie, 58, was part of the team helping Trump prepare for the Presidential debate last Tuesday.

"While I am feeling good and only have mild symptoms, due to my history of asthma we decided this is an important precautionary measure," he tweeted on Saturday evening local time.

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Senator Bernie Sanders, who ran unsuccessfully to be the Democrats' nominee for president this year, has said he wishes Donald and Melania Trump a "full and speedy recovery". He was speaking at a campaign rally in New Hampshire to drum up support for his colleague Joe Biden.

"What the last few days have told us is, if there was ever any doubt, it should now be clear that no one, no one is safe from this pandemic," he told the audience in a field in the city of Lebanon.

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Supporters of Donald Trump have gathered with placards and flowers outside the Walter Reed National Military Hospital near Washington where the president is being treated for coronavirus.

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Around the country rallies were held on Saturday where people wished the president a speedy recovery.

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As the president battles coronavirus just weeks before the US election, we want to help make sense of what could happen on 3 November.

Send us your questions about the US election.

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The life of a president is always busy, but the past week was particularly full-on for Donald Trump as he combined campaigning in the presidential election with running the country. During that time he met with numerous high-ranking officials, including a number at a well-attended event on the White House lawn.

Since the president's diagnosis, several people close to his administration have tested positive, including his campaign manager.

The White House says it has begun tracing who Trump had contact with during the days before he tested positive when it's possible he was infectious.

We've compiled this list of the people we know the president met in the past week, including his pick for the Supreme Court Judge Amy Coney Barrett.

Senate Majority Leader Mitch McConnell, who is the Republican Party's most senior politician in Congress, says he has spoken to Donald Trump on the phone.

"He sounds well and says he's feeling good," MrConnell tweeted shortly after 16:00 local time (21:00 BST).

Hear what Donald Trump's personal physician said when he gave an update earlier on the president's condition from outside Walter Reed Army Medical Center in Washington.

Anthony Zurcher
BBC North America reporter

Image source, Reuters

One would imagine the purpose of the White House medical team's Saturday morning news conference was to reassure the public that the president is doing well and that the nation’s top medical experts are on top of the situation.

Instead, they created more confusion.

Sean Conley, the president’s physician, initially said President Trump was diagnosed "72 hours ago" - which would be Wednesday morning. That is before the president travelled to Minnesota for a campaign rally, before he flew to New Jersey for a fundraiser on Thursday and more than 36 hours before the president revealed his coronavirus diagnosis to the world in a late-night tweet.

The timeline was further muddied by the revelation that the president was given an antiviral treatment 48 hours ago - also before his announcement.

All this necessitated a quick walk-back by the White House, which said the physicians misspoke and that Mr Trump was in "day three" of his treatment and the medicine was administered on "day two".

It is only the latest time over the course of the Trump presidency the White House communications office has had to issue clarifications or clean-ups. Now, however, the stakes couldn’t be higher.

Dr Conley also tried to paint a positive picture of the president's current medical condition, although he was evasive about whether Mr Trump had ever been given oxygen to assist his breathing.

And then, just minutes after the news conference concluded, White House Chief of Staff Mark Meadows struck a very different tone, telling the gathered press "the president’s vitals over the last 24 hours were very concerning and the next 48 hours will be critical in terms of his care".

It is important for the White House to communicate clearly with the American people - and to the world as a whole, where allies and adversaries are closely watching the US situation.

This is not just a health issue for the president, it is a security issue for the entire nation.

Joe Biden's presidential campaign is also ploughing ahead amid the latest developments surrounding Trump's health.

As we reported earlier, the Democratic campaign has suspended all its negative adverts about Mr Trump, but election campaigning itself is continuing.

Image source, Getty Images

On Friday, the Trump campaign suspended all in-person campaign events involving the president or his family.

However Vice-President Mike Pence - who has tested negative - will continue working the campaign trail.

Following Wednesday's debate with Democratic counterpart, California Senator Kamala Harris, he will on Thursday host an in-person "Make America Great Again" event in Peoria, Arizona, the campaign said.

The event is understood to be open to the public and there is reportedly no indication that the crowd will be socially distanced.

The campaign will be handing out face masks and encouraging supporters to wear them, spokesperson Tim Murtaugh said in an emailed statement. Those attending will also receive temperature checks.

It comes after the president was forced to postpone two Arizona events, in Tucson and Flagstaff, early next week after testing positive for Covid-19.

President Trump received oxygen at the White House on Friday before he left for Walter Reed hospital. But what is less clear is why.

The New York Times said he had trouble breathing, leading doctors to give him additional oxygen.

But it is unclear this was the case, or that the president was in need of the oxygen. Patients may be given oxygen as a default option in this situation.

At a briefing on the president's health earlier his personal physician Dr Sean Conley said he was not currently on oxygen, but refused repeatedly to rule out that he had received supplemental oxygen.

Mr Trump's supporters have been out and about around the country to show they back their president.

Image source, Reuters

In New York, supporters gathered at a pro-Trump rally on Staten Island.

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Elsewhere in the country, they took to their boats...

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...travelling from Fort Lauderdale to Boca Raton in Florida.

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And in Ohio, they took to their cars...

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...taking part in a parade in Columbus.

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Earlier, we reported an unnamed source with knowledge of the president's health saying his vital signs were "very concerning" over the past 24 hours.

This person added that the next 48 hours would be critical for Mr Trump, and that he was not yet on the path to recovery.

Now the Associated Press has named the source as White House Chief-of-Staff Mark Meadows.

But in the last few minutes, Meadows has cast the president's condition in a different light, telling reporters that he is "doing very well" and that he had met with him on "multiple occasions" today, according to Reuters news agency.

"He is up and about and asking for documents to review," Meadows reportedly said, adding that doctors were "very pleased" with his vital signs.

Ten people in the president's 'camp' have now tested positive for coronavirus, including his campaign manager, Bill Stepien, and his campaign adviser, Chris Christie.

Seven of them attended an event last weekend in the White House Rose Garden where President Trump announced his pick to be the next Supreme Court justice, Judge Amy Coney Barrett.

Yesterday - before testing positive - Governor Christie told US media that no one had been wearing masks when he and others sat down with Trump to prepare for Tuesday's televised debate with Democratic presidential rival Joe Biden.

"No one was wearing masks in the room when we were prepping the president during that period of time. And the group was about five or six people, in total," he said.

They reportedly included his aide Hope Hicks - believed to be the first to show symptoms - and Mr Stepien.

Hicks, who reportedly started feeling symptoms on Wednesday, tested positive the next day.

Ohio's Governor Mike DeWine has announced a day of prayer on Sunday for the president and his wife Melania.

It is also for "all those suffering from or impacted by coronavirus", the Republican governor tweeted.

According to Johns Hopkins University, the US has recorded 7.3 million cases of the coronavirus and more than 208,000 deaths. Ohio has a death toll of nearly 5,000.

Republican party officials in the state of Maryland meanwhile have asked supporters to gather outside the hospital in support of the president.

"Pick up your friends, pick up your family, and head to Walter Reed Hospital now," a mass email read.

Walter Reed lies in Bethesda, Maryland, to the north of the US capital.