“We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!” the president said in a tweet early on Friday morning.

Trump’s positive test means that others at the highest levels of the U.S. government may have been exposed and have to quarantine, too.

A White House official said contact tracing was under way.

Trump’s physician, Sean Conley, said he expected the president to carry out his duties “without disruption” while he recovers.

“The President and First Lady are both well at this time, and they plan to remain at home within the White House during their convalescence,” Conley wrote in a memo that was distributed to the press.

On Thursday night, shortly after the president said the pandemic’s end was in sight, news broke that Hope Hicks, a top adviser and trusted aide, had tested positive for the virus. Hicks traveled with the president on Air Force One on Tuesday and Wednesday.

British Prime Minister Boris Johnson kept working in isolation for a little over a week after testing positive in late March, but then fell gravely ill and was rushed into intensive care. He spent several weeks recovering before returning to work.

Canadian Prime Minister Justin Trudeau went into quarantine in March after his wife was diagnosed with the coronavirus. Brazil’s President Jair Bolsonaro was infected in July.