Question marks surround the campaign to be the next president of the USA after Donald Trump and his wife Melania tested positive for coronavirus.
Mr Trump said the couple would “get through this together” as they both went into quarantine.
The diagnosis is one of the most serious health threats to a sitting president in decades and comes just over a month before Americans cast their vote.
Here’s what it means for the November 3 election:
Will the election still go ahead?
The election is constitutionally required to take place on November 3.
If Mr Trump is unable to run and withdraws from the race, the Republican national committee could pick a replacement to run on their party’s ticket.
The committee could choose to nominate Mr Pence and another member of the party.
All 168 members of the committee would vote on Mr Trump’s replacement.
No presidential candidate has ever died or withdrawn ahead of the election.
Can Mr Trump still campaign?
Mr Trump will not be able to campaign in person for the foreseeable future.
According to Centre for Disease Control guidance, anyone in the US who tests positive for coronavirus is required to self-isolate for 10 days from the date they received the positive result.
The president had been scheduled to attend a fundraiser and campaign rally in Florida on Friday night. After Mr Trump’s positive result, the White House issued a revised schedule showing several cancelled events.
While Mr Trump is not currently displaying symptoms, the unpredictable nature of the disease means he could get sicker, throwing into doubt the rest of his campaign.
It is thought the president will also have to miss rallies in Wisconsin and Arizona while he quarantines.
Aged 74 and obese, Mr Trump is considered vulnerable.
Mr Trump’s physician, Dr Sean Conley, said both the president and his wife are “well at this time” and the White House team will “maintain a vigilant watch”.
The Trump campaign is feeling “optimistic” and suggested the president “would likely be fine”.
It is not known how many others in the White House came into close contact with the Trumps.
Questions are being asked why Mr Trump did not self-isolate after Hope Hicks, one of his closest aides, tested positive.
Will it hurt his chances of winning a second term?
The diagnosis marks a devastating blow for a president who has been trying desperately to convince the American public that the worst of the pandemic is behind them.
In the best of cases, if he develops no symptoms, which can include fever, cough and breathing trouble, it will force him off the campaign trail just weeks before the election.
In a worst case scenario, Mr Trump could fall seriously ill and may not be able to campaign at all ahead of election day on November 3.
It is possible Joe Biden could get an edge on Mr Trump if he is able to travel to key swing states and win over voters.
Mr Biden has consistently led Mr Trump in national polls, but surveys in battleground states suggest the vote could be much closer.
It is not known if Mr Biden will decide to suspend his campaigning if his rival has to.
What about the second presidential debate?
It is not known if the next televised election debate against Joe Biden, due for October 15, will have to be cancelled or postponed.
If Mr Trump completes his 10 days of isolation and is feeling better, he could theoretically still participate.
One Trump campaign official suggested on BBC’s Radio 4 Today programme the debate could be held virtually.
Can Mr Trump still work?
The White House said both the president and first lady were ‘well at this time’.
Trump was last seen in public on Thursday afternoon, returning to the White House after a fundraising trip to New Jersey. He did not appear ill but he did not speak to reporters as he walked into his residence.
Mr Trump would still be able to work from the White House if he remains feeling well.
His doctor Sean Conley said: “I expect the President to continue carrying out his duties without disruption while recovering.”
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French President Emmanuel Macron at the Elysee Palace in Paris, France. According to a statement by the Elysee Palace, Macron has tested positive for coronavirus. EPA -
Ekrem Imamoglu - Istanbul mayor (October 24) has been hospitalised after testing positive for coronavirus and suffering a fever. Istanbul Mayor's Office via AP -
Andrzej Duda - Polish president (October 24). The 48-year-old conservative leader was tested on Friday, and his spokesman Błażej Spychalskhi reported he was feeling well and was in isolation. AFP -
Boyko Borissov - Bulgarian Prime Minister (October 25) tested positive after a deputy minister who he had been in contact with tested positive for coronavirus. EPA -
Donald Trump – US President (October 2) Less than a day after announcing he had tested positive for Covid-19, Trump was hospitalized at Walter Reed medical centre, and remained in isolation until October 10, held his first public event since his diagnosis, delivering a highly political speech to a crowd of supporters packed on the White House's South Lawn. Reuters -
M. Venkaiah Naidu - Indian Vice President (September 29) tested positive while undergoing a routine COVID-19 test. His office reported that he was asymptomatic and in good health, and was advised to home quarantine. Hindustan Times via Getty Images -
Alejandro Giammattei - Guatemalan President (September 18) After testing positive Giammattei described his symptoms as body aches and a dry cough, and that he was on a nebulizer to avoid pulmonary complications. AFP -
Alexander Lukashenko - Belarus' leader (July 28 ) contracted coronavirus after he repeatedly dismissed the threat posed by the virus, publicised home remedies and refused to shut down his country but recovered without suffering any symptoms, state-run news agency Belta reported. BelTA Pool Photo via AP -
Jeanine Áñez - Bolivia's interim president (July 9) tested positive and posted a video on her Twitter account. "I feel good, I feel strong, I will continue to work virtually from my isolation.” AFP -
Jair Bolsonaro - Brazil's President (July 7), the Far-right president contracted the virus after he repeatedly trivialized the Covid-19 pandemic. AFP -
Isatou Touray - Gambia Vice President (July 29) has tested positive for COVID-19, leading President Adama Barrow to enter self-isolation for the next two weeks, the presidency reported. Reuters -
Juan Orlando Hernandez - Honduras' President Juan Orlando Hernandez (June 16 ) became the first president in Latin America to test positive for the virus. His wife and two aides also tested positive. AFP -
Luis Abinader -Newly elected president of the Dominican Republic (June 11). Abinader and his wife had tested positive for the novel coronavirus, three-and-a-half weeks before the Dominican Republic's presidential election. AFP -
Nikol Pashinyan Armenia's prime minister (June 1) Pashinyan said “I didn’t have any symptoms, I decided to take a test as I was planning to visit the frontline,” adding that his whole family was infected. Reuters -
Riek Machar - South Sudan Vice President (May 19) Machar and his wife Angelina Teny, who serves as defence minister, tested positive for the coronavirus. Reuters -
Mikhail Mishustin - Prime Minister Of Russia (April 30) Mishustin was tasked by Vladimir Putin with leading the response to the country’s coronavirus outbreak, prior to being diagnosed with Covid-19. EPA -
Boris Johnson - The UK prime minister (March 27) after testing positive Johnson said in a video posted on twitter that he was experiencing a temperature and a persistent cough, and that he was working from home and self-isolating. 10 Downing Street via AP -
Prince Albert II of Monaco (March 19). Prince Albert was the first reigning monarch or head of state to publicly announce a positive Coronavirus diagnosis. Getty Images -
Eshaq Jahangiri – Senior Iranian Vice President (March 11) tested positive according to Fars News Agency soon after President Hassan Rouhani took control of the country’s much-criticized response to the virus. Office of the Iranian Vice President via AP) -
Algerian President Abdelmadjid Tebboune (October 26) - began a five-day quarantine on Saturday after senior staff tested positive for the coronavirus. EPA -
Canadian Prime Minister Justin Trudeau’s wife, Sophie Grégoire Trudeau, tested positive for Coronavirus on March 12. The prime minister subsequently went into a 14-day isolation at home with his three kids and remained in isolation for almost a month. Reuters
However, he could be forced to discharge his duties to vice-president Mike Pence if his condition deteriorates.
Prime Minister Boris Johnson was forced to hand over some responsibility to Foreign Secretary Dominic Raab after he was admitted to intensive care suffering from coronavirus.
Mr Johnson had said he was feeling fine after his positive diagnosis before falling gravely ill.
The PM wished his US counterpart a speedy recovery:
Could Mr Trump be forced to hand over power?
The positive test raises questions about what would happen if Mr Trump were to become incapacitated due to illness.
The US Constitution’s 25th Amendment spells out the procedures under which a president can declare themselves “unable to discharge the powers and duties” of the presidency.
If he were to make that call, Mr Trump would send a written note declaring his incapacitation.
Pence would serve as acting president until Trump transmitted “a written declaration to the contrary.”
The vice president and a majority of either the Cabinet or another body established by law, can also declare the president unable to discharge the powers and duties of his office, in which case Mr Pence would “immediately assume the powers and duties of the office as Acting President” until Trump could provide a written declaration to the contrary.
What if Mike Pence falls ill?
Mr Pence’s aides had no immediate comment on whether the vice-president had been tested or in contact with Mr Trump.
However, if the vice president falls seriously ill, he would be forced to hand over power to House Speaker Nancy Pelosi, who is second in the order of succession.
The vice-president wished the Trumps well as the couple make their recovery:
