The US president and the first lady have tested positive for COVID-19 after a senior aide was found to have the virus. The diagnosis has thrown Trump's reelection campaign into turmoil, a month before the US votes.
Trump tweeted that he and his wife Melania would begin their "recovery process immediately" and "get through this together."
The Trumps had entered quarantine earlier in the day after senior aide Hope Hicks had also tested positive.
She spent a substantial amount of time in close proximity with Trump this week, including traveling with him to a campaign rally on Wednesday, the Associated Press reported, citing an administration official.
She also traveled with Trump several other days this week, including on board the presidential helicopter Marine One as well as on Air Force One.
President doing 'well'
Minutes after Trump tweeted his positive test result, the White House physician said the president was "well" and would continue to perform his duties "without disruption" while quarantining along with the first lady.
Dr. Sean Conley said the pair plans to "remain home at the White House during their convalescence."
At 74 and obese, Trump is at a higher risk of developing severe complications from COVID-19.
While most people have only mild symptoms, some older people — usually those with other medical complications — develop more severe symptoms, including pneumonia, which can be fatal.
What now for election campaigning?
Trump becomes the highest-profile world leader to contract the virus, just a month before he seeks a second term in the White House.
The diagnosis is a major setback for his reelection plan as he continues to trail his Democratic rival Joe Biden in the polls.
Immediately, the White House canceled plans for the president to attend a campaign fundraiser and to fly to Florida for a rally later Friday.
Trump will almost certainly have to cancel a trip scheduled for this weekend in Wisconsin, another election battleground.
Plans to travel to western US states next week on the campaign trail also look set to be called off.
First Lady Melania Trump acknowledged on Twitter that the pair had "postponed all upcoming engagements."
But her Chief of Staff Stephanie Grisham wrote that "nothing" would stop the pair from "fighting for the American people."
White House Press Secretary Kayleigh McEnany, meanwhile, tweeted: "Your President will continue to put the People first!
It wasn't immediately unclear whether Trump would be fit for the second presidential debate on October 15.
If Trump were unable to do his job — even due to a short illness — the 25th Amendment to the United States Constitution allows the vice president becomes the president.
US Vice President Mike Pence wrote on Twitter that he and his wife Karen were sending "love and prayers to our dear friends," before adding: "We join millions across America praying for their full and swift recovery."
The world reacts
President of the European Council Charles Michel tweeted to wish the pair a "speedy recovery."
He said "#COVID19 is a battle we all continue to fight. Everyday. No matter where we live."
Indian Prime Minister Narendra Modi also tweeted his support.
While China has yet to formally comment, Hu Xijin, Editor in Chief of China's Global Times, tweeted: "President Trump and the first lady have paid the price for his gamble to play down the COVID-19. The news shows the severity of the US' pandemic situation. It will impose a negative impact on the image of Trump and the US, and may also
negatively affect his reelection."
Friday's announcement sparked an immediate drop in US stock futures. The Dow slumped 1.7% and the broader S&P 500 shed 1.6%. Japan's Nikkei closed down almost a percent and European stock markets opened lower.
Jörge Krämer, a financial analyst at Germany's Commerzbank, said the diagnosis could even help the president's reelection chances.
"If Trump does not develop serious symptoms, he could present himself as a strong man and benefit from it like Brazilian President Bolsonaro. If, on the other hand, he becomes seriously ill,
it should be difficult for him to catch up with Joe Biden."
Naoya Oshikubo, economist at Sumitomo Mitsui Trust, said the positive test result was another kick in the teeth for Trump after he failed to narrow a poll gap after the first televised debate.
"I suspect markets will tend to believe that Biden is likely to win the election."
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White House aides tested daily
After several earlier positive cases close to the president, the White House began conducting daily tests for Trump's senior aides and anyone else in close proximity with the president or vice president Mike Pence — including reporters.
Trump has been criticized for his response to the pandemic, including playing down the threat and refusing to abide by public health guidelines — including wearing masks.
His positive test comes after several other world leaders contracted the virus, including Brazilian President Jair Bolsonaro.
British Prime Minister Boris Johnson spent a week in the hospital, including three nights in intensive care, where he was given oxygen and watched around the clock by medical workers.
Earlier in the year, German Chancellor Angela Merkel self-isolated after a doctor who gave her a vaccination tested positive for the virus.
Coronavirus: Politicians who've tested positive
French President Emmanuel Macron is the latest top-tier politician to come down with a case of COVID-19. He's the latest among several, perhaps unsurprisingly given politicians' busy schedules and frequent travel.
Image: Olivier Hoslet/REUTERS
Emmanuel Macron
French President Emmanuel Macron tested positive for the virus on December 17. Following the diagnosis, he canceled all of his upcoming trips, including one to Lebanon, and said he would self-isolate for seven days. French Prime Minsiter Jean Castex was also set to isolate after coming into contact with Macron.
Image: Olivier Hoslet/REUTERS
Andrzej Duda
Polish President Andrzej Duda tested positive for coronavirus in October, as the country was facing surge in new infections. Duda, an ally of the ruling nationalist Law and Justice Party, was "feeling fine" at the time of the diagnosis. The day before officials announced his infection, the number of new cases in the country of 38 million hit a daily record of more than 13,600.
Image: Reuters/A. Szmigiel
Donald Trump
Donald Trump, who once said COVID-19 tests were "beautiful," tested positive for the coronavirus, along with his wife Melania, soon after senior aide Hope Hicks also contracted the virus. The infection came less than a month before November's presidential elections in the US.
Image: Doug Mills/abaca/picture alliance
Ambrose Dlamini
Prime Minister of Eswatini Ambrose Dlamini died at the age of 52 after contracting coronavirus. He was the first sitting leader to succumb to the virus.
Image: RODGER BOSCH/AFP
Valery Giscard d'Estaing
Former French President Valery Giscard d'Estaing died aged 94 on December 2 after contracting COVID-19. During his rule, he legalized abortion and brought the country high-speed trains. He also promoted cooperation among European nations, especially in tandem with the former West Germany, forging a strong rapport with Chancellor Helmut Schmidt.
Image: Stephane De Sakutin/AFP/Getty Images
Silvio Berlusconi
The 83-year-old former Italian premier tested positive for the virus and is believed to be asymptomatic, his party announced on September 2. Two of Berlusconi's children as well as his 30-year-old girlfriend are also COVID-19 positive. The ex-premier tested positive after vacationing along Sardinia's coastline, where Italy's rich and famous have been known to flaunt mask policies.
Image: picture-alliance/dpa/D. Vojinovic
Jair Bolsonaro
Brazil's president, who has repeatedly downplayed the severity of the pandemic, contracted the virus in July. He was criticized for ignoring the safety measures recommended by health experts both before and after his diagnosis, including shaking hands and hugging supporters in crowds. His wife and sons also tested positive.
Image: picture-alliance/dpa/E. Peres
Boris Johnson
In late March, British Prime Minister Boris Johnson came down with a coronavirus infection that landed him in the hospital for several days. Johnson spent a week at a hospital in London and three nights in intensive care where he was given oxygen and observed around the clock. He was released in mid-April and credited hospital staff with saving his life.
Image: picture-alliance/AP Photo/S. Dawson
Michel Barnier
Michel Barnier, the EU's chief Brexit negotiator, tested positive for the virus in March. The top Brussels official sent out a tweet in English as well as French saying he was doing well and "in good spirits." He added: "I am following all the necessary instructions, as is my team."
Image: Reuters/Y. Herman
Alexander Lukashenko
Belarus's embattled President Lukashenko told military officials on July 28 that he had survived an "asymptomatic" COVID-19 infection "on his feet," days before his contentious re-election. The claim met skepticism given its timing. He initially dismissed fears about the pandemic as a "psychosis" and went as far as suggesting cures such as drinking vodka, taking saunas and playing ice hockey.
Image: picture-alliance/Russian Look/V. Listsyn
Jeanine Anez
Bolivia's interim president Jeanine Anez announced on July 10 that she had the virus. "I feel well, I feel strong, I am going to keep working remotely from my isolation, and I want to thank all the Bolivians who are working to help us in this health crisis," the leader tweeted at the time.
Image: AFP
Juan Orlando Hernandez
The president of Honduras spent time being treated at a military hospital after falling ill with coronavirus in June. He received specialized care including receiving medicines via an intravenous drip. His wife and two presidential aids also tested positive. Hernandez left hospital in early July after his symptoms improved.
Image: picture-alliance/AP Photo/J. Martin
Alejandro Giammattei
The Guatemalan president told local radio on September 18 that he had tested positive for the virus. The 64-year-old, who has multiple sclerosis and uses canes to walk, said his symptoms were mild. The government said Giammattei plans on monitoring his health and continuing official duties from isolation.
Image: Johan Ordonez/AFP
Abdelmadjid Tebboune
Algerian President Abdelmadjid Tebboune was flown to Germany hospital for treatment after contracting the virus. The 74-year-old looked haggard and spent in his public appearance 47 days after testing positive.
Image: Ryad Kramdi/AFP
Luis Abinader
Luis Abinader, the newly elected president of the Dominican Republic, tested positive during his election campaign. He recovered before the July election and spent one week in isolation.
Image: Getty Images/AFP/O. Barria
Jens Spahn
German Health Minister Jens Spahn, who has led Germany's fight against the pandemic, tested positive for the coronavirus in October and had "cold-like symptoms." He went into immediate isolation and soon recovered. Despite a couple of self-isolation scares for Angela Merkel and other ministers, Spahn remains Germany's highest-profile political case to date.
Image: Daniel Karmann/dpa/picture alliance
Not an exhaustive list
This gallery does not include all major politicians who have contracted the coronavirus. Others, such as Bulgarian Prime Minister Boyko Borissov, Moldovan Prime Minister Ion Chicu, Armenian Prime Minister Nikol Pashinyan, and Croatian Prime Minister Andrej Plenkovic, are just some of the other top politicians who have contracted the virus.