The New York Times reports:
Mr. Giuliani was at Georgetown University Medical Center, according to a person who was aware of his condition but not authorized to speak publicly. Mr. Giuliani has repeatedly been exposed to the virus through contact with infected people, including during Mr. Trump’s preparation for his first debate against President-elect Joseph R. Biden Jr. in September, just before the president tested positive, as well as when he appeared with his son, Andrew, at a news conference at the Republican National Committee headquarters about two weeks ago. Andrew Giuliani, who works as an aide in the White House, said on Nov. 20 that he had tested positive, days after Donald Trump Jr. did.
NEW: Rudy Giuliani has been hospitalized with COVID at at Georgetown University Medical Center.
— Brian Tyler Cohen (@briantylercohen) December 6, 2020
.@ABC News has confirmed Rudy Giuliani admitted to Georgetown Hospital Sunday. Unclear when exactly he tested positive. W/ @KFaulders – first via @maggieNYT https://t.co/jDMOn0n641
— John Santucci (@Santucci) December 6, 2020