The president has been fever free for 24 hours; is not currently receiving supplemental oxygen and has normal organ function, the doctors said, declining to predict when he might discharged. He will be on a five-day course of an experimental drug treatment, the doctors said.
The briefing triggered confusion about when Trump became sick.
Conley said Trump was "72 hours into the diagnosis," suggesting that he became infected on Wednesday, but still chose to attend a fundraiser in New Jersey on Thursday night.
The doctors said Trump had a cough, nasal congestion, and fatigue on Thursday, symptoms that have since begun improving and resolving. They also suggested he received an antibody treatment on Thursday morning.
Trump told his doctors, “I feel like I could walk out of here today,” the doctors said.
Conley said the president's medical team was "cautiously optimistic" about the president's progress.
Adding to the confusion, a White House aide, who refused to include their name, told reporters that the president's condition may been more serious than the physician suggested.
"The President's vitals over last 24 hours were very concerning and the next 48 hours will be critical in terms of his care," the aide said in a statement. "We are still not on a clear path to a full recovery."
It was unclear whether the aide or the president's physician had more update information.
Reporters pressed Conley about whether the president has ever received supplemental oxygen and Conley persistently said the president had not received oxygen on Thursday or while at Walter Reed on Friday and Saturday.
Conley said the president asked about the antimalarial drug hydroxychloroquine as a potential treatment. Trump has championed the drug, despite little evidence it can treat the coronavirus. Conley said they discussed it but have not prescribed it to the president.
The president was transported by helicopter to the Walter Reed National Medical Center in Bethesda, Md. on Friday, following a positive coronavirus test late Thursday night.
Asked about the hospitalization, Conley said the decision was made "because he's the president of the United States."
The White House had previously said the president was experiencing mild symptoms, noting that the move to the military hospital was a “precautionary measure" and that the president would continue working from offices located in the facility.
Trump is one of the more than 410,000 Americans who have been hospitalized in the U.S. because of the deadly virus, according to data from The COVID Tracking Project. The U.S. has had more than 7 million confirmed cases and more than 200,000 deaths.
The White House released several statements from Conley on Friday. In one statement, Conley said Trump was “doing very well,” and had decided to begin treatment with the experimental drug called remdesivir.
Remdesivir is an experimental antiviral therapy that has been shown to help those with severe cases of the coronavirus.
Vice President Mike Pence and Second Lady Karen Pence tested negative for the coronavirus on Saturday, after negative tests on Friday; Pence remains at his residence in the Naval Observatory.
First lady Melania Trump, who also contracted the coronavirus, remains in the White House residence.
“Mrs. Trump is doing well. Her symptoms have not worsened and she continues to rest. She remains in touch with her husband. She is thinking of all who are ill and wishes them a speedy recovery,” said Stephanie Grisham, the first lady’s chief of staff, said in a statement.
The president, who has been unusually quiet on Twitter during his illness, tweeted Friday night: "Going well, I think! Thank you to all. LOVE!!!"
This article originally appeared on NBCNews.com.