President Donald Trump immediately removed his face mask when he returned to the White House on Monday evening, despite testing positive for the coronavirus less than a week ago and amid an ongoing outbreak among staffers in the West Wing.

The president left Walter Reed National Military Medical Center just minutes earlier after a three-day stay in the hospital. He had been admitted on Friday just hours after he revealed that both he and first lady Melania Trump had tested positive for the virus, a cluster that has since spread through his White House staff and congressional halls of power.

I learned so much about coronavirus, and one thing thats for certain: Dont let it dominate you. Dont be afraid of it. Youre going to beat it, Trump declared in a video shortly after his arrival (more than 210,000 people have died of COVID-19 in the U.S.). I went, I didnt feel so good, and two days ago, I couldve left two days ago, I felt great, like better than I have in a long time. Dont let it dominate, dont let it take over your lives, dont let that happen.

Reporters noted that several photographers filming Trumps return to the White House appeared to be near the president as he took off his mask.

Soon after, Trump released a video of his arrival on Twitter, which includes footage of him without a face covering as military members and White House aides look on.

The White House did not immediately return HuffPosts request for comment. Its unclear if Trump will wear a mask at the White House while he remains infectious (the Centers for Disease Control and Prevention say that period could last between 10 and 20 days , depending on the severity of the individual case).

Questions remain about the severity of the presidents illness. His medical team has said repeatedly that he is doing very well, but outside experts have expressed concern amid reports that Trumps blood oxygen levels fell below 95% at least twice since he contracted the virus.

Trump moved quickly to minimize his own infection, regularly tweeting that he is feeling really good! while releasing campaign-style videos from inside the hospital and driving outside for a photo op.

Dont be afraid of Covid. Dont let it dominate your life, the president posted on Monday shortly before departing Walter Reed. We have developed, under the Trump Administration, some really great drugs & knowledge. I feel better than I did 20 years ago!

Trump did acknowledge that he wasnt feeling well, at least temporarily, in the days after his first positive test as he went to the hospital.

As your leader, I had to do that. I knew theres danger to it, but I had to do it, he said in the Twitter video.

He added: I stood out front, I led. Nobody thats a leader would not do what I did. And I know theres a risk, theres a danger, but thats OK. And now Im better, and maybe Im immune, I dont know.

The nations top medical officials have continued to urge the use of face masks to minimize the spread of COVID-19. Dr. Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, said Monday that a White House event last month to celebrate the nomination of Judge Amy Coney Barrett to the Supreme Court was the type of dangerous situation hed long warned about. At least nine attendees have since tested positive for the virus.

Also on Monday, former Vice President Joe Biden , Trumps Democratic competitor for the White House, called for the president to listen to the scientists and implement a nationwide mask mandate.

I would ask him to do this: Listen to the scientists, Biden said while speaking in Miami. Support masks. Support a mask mandate nationwide. Require masks in every federal building and facility, and in interstate travel. Urge every governor and mayor to do the same. We know it saves lives.