By Steve Holland and Alexandra Alper
WASHINGTON (Reuters) - U.S. President Donald Trump was in a military hospital on Saturday for treatment after testing positive for COVID-19, an extraordinary development that upended the presidential race a month before the Nov. 3 election.
Roughly 17 hours after he made his diagnosis public, Trump walked slowly on Friday from the White House to a waiting helicopter to be taken to Walter Reed National Military Medical Center in Bethesda, Maryland. He wore a mask and business suit and did not speak to reporters.
"I think I'm doing very well, but we're going to make sure that things work out," Trump said in a brief video message posted on Twitter. Early on Friday, he had tweeted that he and the first lady, Melania Trump, had contracted the virus.
Trump will work in a special suite at the hospital for the next few days as a precautionary measure, White House press secretary Kayleigh McEnany said.
Trump had no public events scheduled on Saturday.
Online video showed a small group of Trump supporters outside Walter Reed late on Friday waving Trump 2020 flags, most not wearing masks.
Trump, 74, has a mild fever, according to a source familiar with the matter. White House doctor Sean P. Conley said late on Friday that Trump was doing very well, did not need supplemental oxygen, and had received a first dose of Remdesivir, an intravenous antiviral drug sold by Gilead Sciences Inc (NASDAQ:GILD) that has been shown to shorten hospital stays.
Conley is scheduled to provide an update on Trump's condition at 11 a.m. (1500 GMT).
In a tweet late on Friday, the president wrote: "Going well, I think! Thank you to all. LOVE!!!"
The diagnosis was the latest setback for the Republican president, who is trailing Democratic rival Joe Biden in opinion polls ahead of the Nov. 3 presidential election.
Trump has downplayed the threat of the coronavirus pandemic from the outset, even as the disease has killed more than 200,000 Americans and hammered the U.S. economy.
A number of other prominent Republicans also tested positive on Friday, including former White House senior adviser Kellyanne Conway and Republican Senators Mike Lee and Thom Tillis.
On Saturday, a third senator was diagnosed with COVID-19: Republican Ron Johnson, chairman of the Senate Homeland Security Committee.
Vice President Mike Pence, who would take over presidential duties if Trump became severely ill, tested negative, a spokesman said. The former Indiana governor, 61, is working from his own residence about three miles from the White House.
Trump is at high risk because of his age and weight. He has remained in apparent good health during his time in office but is not known to exercise regularly or to follow a healthy diet.
Conley said earlier on Friday that Trump has received an experimental treatment, Regeneron's REGN-COV2, one of several experimental COVID-19 drugs known as monoclonal antibodies, which are used for treating a wide range of illnesses.
Trump is also taking zinc, Vitamin D, famotidine, melatonin and aspirin, Conley said.
British Prime Minister Boris Johnson, who was himself hospitalized with COVID-19 in April, said on Saturday he had no doubt Trump would make a strong recovery.
"He's a naturally obviously very resilient character and I'm sure he'll come through it very well," Johnson told reporters.
Chinese President Xi Jinping, joining well-wishers at home and abroad, sent a message to Trump and his wife on Saturday, wishing them a speedy recovery, Chinese state television reported.
ELECTION DAY LOOMS
With just 31 days to go until Election Day, Trump's campaign said it would postpone rallies and other events where he was scheduled to appear, or take them online.
Trump's campaign manager, Bill Stepien, also tested positive for COVID-19 on Friday and will work from home, according to a senior campaign official.
Biden pulled ads attacking Trump off the air but otherwise continued his campaign, traveling to Michigan on Friday after testing negative for the virus.
In a Twitter post on Saturday, Biden urged Americans to don masks. "Don't just do it for yourself. Do it for the people you love."
The Republican National Committee would choose a replacement nominee if Trump were to become incapacitated, but it is too late in most states to change the names on the ballot. Some 2.9 million people have already voted, according to figures compiled by University of Florida professor Michael McDonald.
Pence took over Trump's planned calls with governors and retirees' organizations. His Oct. 7 debate with Democratic vice presidential candidate Kamala Harris will go forward as planned, organizers said.
Harris has also tested negative, according to the campaign.
The virus could complicate Trump's push to install conservative judge Amy Coney Barrett on the Supreme Court.
Lee and Tillis are both members of the Republican-controlled Senate Judiciary Committee, which is scheduled to begin hearings on Barrett's nomination on Oct. 12.
Barrett herself tested positive for the virus earlier this year and recovered, according to a person familiar with the matter.
Tillis, who said in a statement that he has no symptoms, will isolate at home for 10 days. Polls show a close race between him and Democratic challenger Cal Cunningham for his North Carolina seat, one of several Democrats hope to flip in their quest to win a Senate majority in November.