A source familiar with the matter confirmed to CNN that Giuliani entered Georgetown University Hospital on Sunday.
No further details have been provided about his condition, and it is not clear when Giuliani tested positive for Covid-19. He and his spokeswoman did not respond to CNN’s requests for comment.
Giuliani has repeatedly ignored public health guidelines, appearing unmasked in the state Capitol, hotel ballrooms, and at home press conferences in recent weeks. In many of the events, most of the other people indoors weren’t wearing masks either.
In some of those events, Giuliani was seen shaking hands, hugging and taking pictures with people without a mask.
He was last seen at the Georgia Capitol in Atlanta on Thursday to attend a Georgia state Senate hearing on the November elections. During a break in the session, Giuliani took off the mask he was wearing to greet and take pictures with his supporters.
He traveled to Michigan on Wednesday to attend a four-and-a-half-hour state assembly committee hearing, during which he was unmasked as he pleaded with misleading claims that the election was stolen from Trump.
Hours before Trump announced his diagnosis, Giuliani was interviewed on the Fox News satellite.
The 76-year-old is considered to be at high risk of developing complications from the Coronavirus due to his age.
Giuliani was traveling with Trump campaign attorney Gina Ellis, who appeared alongside him at all of the events related to the 2020 election last week.
On Sunday, Ellis posted a “prayer for Mayor RudyGiuliani” and described him as a “strong warrior.” She pledged that the President’s legal team would continue its efforts to cancel the election results.
Trump’s campaign communications director, Tim Murtaugh, declined to comment on Giuliani’s condition, whether Ellis has tested positive, or is planning to quarantine. CNN referenced tweets from Trump and Ellis.
Last month, Giuliani’s son Andrew, a White House employee, tested positive for Covid-19 after attending a news conference of the Trump campaign’s legal team with his father in Washington, DC.
Andrew Giuliani wrote on Twitter Sunday evening that his father was “resting, getting great care and feeling better”.
Giuliani also avoided quarantine guidelines from the US Centers for Disease Control and Prevention after his son tested positive, and was in close contact and campaign advisor Boris Epstein, in late November. On the day Epstein announced he had contracted the virus, Giuliani traveled to Gettysburg, Pennsylvania, where he addressed a group of Republican lawmakers in the state in a crowded hotel hall.
Giuliani was also close to Bill White, a Trump supporter in Georgia who attended the president’s meeting Saturday night in Valdosta. White shook hands and hugged Giuliani last week.
Elena Barnet, a senator from the Democratic state of Georgia, who attended the hearing at the Georgia Capitol building on Thursday with Giuliani, told CNN that Giuliani and his team “willingly put us all at risk in order to please Trump.”
“It was reckless and irresponsible for Republicans in the Georgian Senate to hold a hearing in person without the need for masks and social distancing during the outbreak. Obviously, the threat of COVID from (Giuliani) and the team, who were attending the hearings without masks across the country, It was loud and they willingly put us all at risk to please Trump, ”Parent said in an emailed statement to CNN Sunday.
“Mayor Giuliani’s blatant disregard for public safety measures in this epidemic is irresponsible and puts Georgians at risk,” she added.
This story has been updated with additional reports.
CNN’s Annie Gray, Wesley Brewer, Holly Silverman, Mel Alonso and Donald Judd contributed to this report.