Donald Trump and his wife Melania have tested positive for coronavirus.
In a tweet, the president said: “Tonight, @FLOTUS and I tested positive for COVID-19. We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!”
Mr Trump, 74, earlier said he and the first lady, 50, were self-isolating after Hope Hicks, one of his top aides, tested positive.
Melania Trump tweeted: “As too many Americans have done this year, @potus & I are quarantining at home after testing positive for COVID-19. We are feeling good & I have postponed all upcoming engagements.
“Please be sure you are staying safe & we will all get through this together.”
A letter from Sean Conley, physician to Mr Trump, confirmed the positive test on Thursday and said the president and first lady would remain at the White House during their isolation.
It added: “The White House medical team and I will maintain a vigilant watch, and I appreciate the support provided by some of our country’s greatest medical professionals and institutions.
“Rest assured I expect the president to continue carrying out his duties without disruption while recovering, and I will keep you updated on any future developments.”
Ms Hicks, 31, who serves as a counsellor to the president, reportedly tested positive for the disease on Thursday, the day after she travelled with the president to a rally. She is the closest aide to Mr Trump to test positive for coronavirus so far.
She has travelled with the president a number of times during the past week, including on presidential helicopter Marine One, and on Air Force One to Tuesday night’s first presidential debate.
The positive tests come as the virus continues to spread at an alarming rate in the US, even as Mr Trump has tried to downplay the threat of the disease.
Mr Trump has continued to hold campaign rallies during which have drawn thousands of supporters during the COVID-19 pandemic.
More than 200,000 people have died in the US after contracting coronavirus and more than seven million have been infected.