The president's doctor, Sean Conley, is a Doylestown, Pennsylvania native and a graduate of the Philadelphia College of Osteopathic Medicine.
Dr. Conley, who is a 1998 graduate of Central Bucks High School East, has served as the president's physician since 2018.
Conley enlisted in the ROTC as an undergraduate at Notre Dame and served as a Naval physician until being assigned to the White House.
He was first put under the spotlight in May after revealing the president took hydroxychloroquine as a prophylactic while under his care. Hydroxychloroquine has yet to be proven effective as a preventative for COVID-19.
VIDEO: Doctors' Sunday update on Pres. Trump's condition
With President Donald Trump battling coronavirus at Walter Reed National Military Medical Center, Conley has come under fire for making confusing and misleading comments -- including one he later walked back -- about the president's condition
After Saturday's televised briefing at Walter Reed, a White House official offered a more alarming assessment of Trump's health to reporters. That reporting was initially given to a pool of reporters attributed to an official familiar with the president's condition. Later, the Associated Press and the New York Times identified that official as White House chief of staff Mark Meadows.
Conley claimed at Sunday's briefing that Meadows' widely reported statement contradicting him was "misconstrued."
"The chief and I work side by side," Conley said. "And I think his statement was misconstrued. What he meant was that 24 hours ago, when he and I were checking on the president, that there was that momentary episode of the high fever and that temporary drop in the saturation, which prompted us to act expediently to move him up here."
Conley added, "Fortunately, that was really a very transient limited episode, a couple hours later he was back up. Mild again. You know, we, I'm not going to speculate what that limited episode was about so early in the course but he's doing well."
Conley on Sunday also defended the decision to not disclose that the president was administered oxygen by saying he wanted to "reflect the upbeat attitude of the team."
"I was trying to reflect the upbeat attitude that the team, the president, his course of illness has had. I didn't want to give any information that might steer the course of illness in another direction, and in doing so it came off that we were trying to hide something," Conley said, adding that "wasn't necessarily true."
"The fact of the matter is he's doing very well," Conley went on.
Conley served in various military posts, primarily at Naval Medical Center Portsmouth. He was the senior medical officer at the center's department of emergency medicine. Conley also served as department director at a NATO hospital in Kandahar, Afghanistan.
He replaced Dr. Ronny Jackson, a Navy rear admiral who was nominated to be secretary of veterans affairs. Jackson later withdrew following a string of allegations that included he loosely handled prescription pain medications, was intoxicated during an overseas trip and created a toxic work environment. Jackson denied the allegations. He is now running for a Texas congressional seat as a Republican.
-- CNN contributed to this report.