President didn't disclose 1st positive test, sources say

Department of Justice spokeswoman Kerri Kupec told reporters that Attorney General Bill Barr is self-quarantining at home, but has so far tested negative for the virus.

The spokeswoman would not provide more details about Barr’s self-quarantine.

This is the third time he has tested negative for COVID-19 since last Tuesday's debate. Barr attended the Sept. 26 event at the White House where President Trump announced Judge Amy Coney Barrett as his Supreme Court Justice nominee.

Several Trump administration officials who contracted the virus last week, including Kellyanne Conway and former Gov. Chris Christie, attended the event and were not wearing masks during the outdoor ceremony.

Barr was photographed talking with Conway while not wearing a mask during the event.

-ABC News’ Alexander Mallin

Before making an appearance on Sean Hannity's show on Fox News Thursday evening, President Trump had already tested positive that evening for COVID-19 from a rapid test, multiple sources familiar with the matter told ABC News. 

The president did not reveal the results of his first positive test as he awaited results from the more accurate PCR test. However he confirmed to Hannity that top aide Hope Hicks had tested positive. 

"She did test positive. I just heard about this. She tested positive,” Trump said.

"And I just went out with a test, I’ll see -- you know, ‘cause we spend a lot of time -- and the first lady just went out with a test also," he said.

-ABC News' Katherine Faulders and John Santucci

With little warning, President Donald Trump left Walter Reed Hospital for a few minutes in his motorcade Sunday evening to greet supporters who were outside.

Trump, appearing with a mask from the window of his vehicle, was seen waving to a crowd.

The president tweeted a video before the drive-by appearance thanking his supporters and saying he was going to "make a little surprise visit."

Trump also said in the video that he visited soldiers and first responders at the hospital.

It was not immediately known if there was anyone else in the car aside from the driver. A Secret Service spokesperson declined to comment on the impact of Trump’s trip on the health and safety of their agents, saying they "do not comment on presidential protection."

A senior administration official told ABC News afterward that Trump had returned to the hospital and that he had not been discharged.

Administration member Judd Deere subsequently put out a statement saying that, "President Trump took a short, last-minute motorcade ride to wave to his supporters outside and has now returned to the Presidential Suite inside Walter Reed."

There have been no updates on Trump's condition from his physicians since earlier in the day, when they told reporters he could be released as early as Monday.

-ABC News' John Santucci, Justin Fishel, Elizabeth Thomas and Jack Date

President Donald Trump posted on Twitter Sunday afternoon that he appreciates "all of the fans and supporters outside of the hospital."

The medical team treating the president is hopeful that he will be discharged from Walter Reed Medical Center on Monday.