President will continue treatment at the White House despite doctor’s cautious prognosis

WASHINGTON—President Trump returned to the White House to continue his care after three days in the hospital, despite doctors’ cautious prognosis for his Covid-19 illness and the spread of the contagion among top aides just a month before the election.

Mr. Trump, wearing a surgical mask, walked out the front door of Walter Reed National Military Medical Center, where he has been receiving treatment since Friday evening. He pumped his fist before walking down the stairs and giving a thumbs-up to reporters as he entered a black...