BETHESDA, Md. (AP) — President Donald Trump said Monday he's leaving the military hospital where he has been treated for COVID-19 and will continue his recovery at the White House. He said he's feeling good and the nation should not be afraid of the virus that has killed more than 209,000 Americans.

Trump's expected return comes after he has received an exceptionally aggressive course of treatment and a standard of care well above what is available to average Americans. Because of that, his doctor, Navy Cdr. Sean Conley, said the president was in "uncharted territory" and would not be fully out of the woods for another week.

Trump himself made a point of sounding confident. He tweeted, "I will be leaving the great Walter Reed Medical Center today at 6:30 P.M. Feeling really good! Don't be afraid of Covid. ... I feel better than I did 20 years ago!"

Conley was also upbeat at an afternoon briefing and said the president could resume his normal schedule once "there is no evidence of live virus still present." According to the Centers for Disease Control and Prevention, those with mild to moderate symptoms of COVID-19 can be contagious for as many — and should isolate for at least — 10 days.

Trump's expected discharge raised new questions about how the administration was going to protect other officials from a disease that remains rampant in the president's body, and came as the scale of the outbreak at the White House itself is still being uncovered. Press secretary Kayleigh McEnany announced she had tested positive for the virus Monday morning and was entering quarantine.

Conley repeatedly declined to share results of medical scans of Trump's lungs, saying he was not at liberty to discuss the information because Trump did not waive doctor-patient confidentiality on the subject. COVID-19 has been known to cause significant damage to the lungs of some patients. Conley also declined to share the date of Trump's most recent negative test for the virus — a critical data point for contact tracing and understanding where Trump was in the course of the disease.

Trump's nonchalant message about not fearing the virus comes as his own administration has encouraged Americans to be very careful and take precautions to avoid contracting and spreading the disease as cases continue to spike across the country. For more than eight months, Trump's efforts to play down the threat of the virus in hopes of propping up the economy ahead of the election have drawn bipartisan criticism.

Only a day earlier, Trump suggested he had finally grasped the true nature of the virus, saying in a video, "I get it."

On Sunday afternoon, Trump briefly ventured out of the hospital while contagious to salute cheering supporters by motorcade — an outing that disregarded precautions meant to contain the virus.

White House officials said Trump was anxious to be released after three nights at Walter Reed National Military Medical Center, where doctors revealed on Sunday that his blood oxygen level had dropped suddenly twice in recent days and that they gave him a steroid typically only recommended for the very sick.

Trump's experience with the disease has been dramatically different from most Americans, who do not have access to the same kind of monitoring and care. While most must cope with their symptoms — and fear of whether they'll take a turn for the worse — at home and alone, Trump has been staying in the presidential suite of one of the nation's best hospitals and has been given experimental drugs not readily available to the public. He returns to the White House where there is a team of doctors on call with 24-hour monitoring.

Less than one month before Election Day, Trump was eager to project strength despite his illness. The still-infectious president surprised supporters who had gathered outside the hospital, riding by Sunday in a black SUV with the windows rolled up. Secret Service agents inside the vehicle could be seen in masks and other protective gear.

The move capped a weekend of contradictions that fueled confusion about Trump's health, which has imperiled the leadership of the U.S. government and upended the final stages of the presidential campaign. While Trump's physician offered a rosy prognosis on his condition, his briefings lacked basic information, including the findings of lung scans, or were quickly muddled by more serious assessments of the president's health by other officials.

In a short video released by the White House on Sunday, Trump insisted he understood the gravity of the moment. But his actions moments later, by leaving the hospital and sitting inside the SUV with others, suggested otherwise.

McEnany spoke briefly with reporters Sunday evening without wearing a mask, but said that no members of the White House press corps spent enough time around her to be considered close contacts.

Joe Biden's campaign, meanwhile, said the Democratic presidential nominee again tested negative for coronavirus Sunday. The results came five days after Biden spent more than 90 minutes on the debate stage with Trump. Biden, who has taken a far more cautious approach to in-person events — and has been mocked repeatedly for it by Trump — had two negative tests on Friday.

Trump's doctors sidestepped questions on Sunday about exactly when his blood oxygen dropped — episodes they neglected to mention in multiple statements the day before — or whether lung scans showed any damage.

It was the second straight day of obfuscation from a White House already suffering from a credibility crisis. And it raised more doubts about whether the doctors treating the president were sharing accurate, timely information with the American public about the severity of his condition.

Even before Trump's motorcade outing on Sunday, some Secret Service agents had expressed concern about the lackadaisical attitude toward masks and social distancing inside the White House, but there isn't much they can do, according to agents and officials who spoke to The Associated Press. This close to the election, thousands of agents are engaged on protective duty so they can be subbed out quickly should someone test positive.

According to CDC guidelines, in general, transport and movement of a patient with suspected or confirmed infection of the virus that causes COVID-19 "outside of their room should be limited to medically essential purposes."

The disclosures about Trump's oxygen levels and steroid treatment suggested the president is enduring more than a mild case of COVID-19.

Trump's treatment with the steroid dexamethasone is in addition to the single dose he was given Friday of an experimental drug from Regeneron Pharmaceuticals Inc. that supplies antibodies to help the immune system fight the virus. Trump on Friday also began a five-day course of remdesivir, a Gilead Sciences drug currently used for moderately and severely ill patients. The drugs work in different ways — the antibodies help the immune system rid the body of virus, and remdesivir curbs the virus' ability to multiply.

The steroid's use has only been proven to help in more serious cases. Among the concerns with earlier use is that steroids tamp down certain immune cells, hindering the body's own ability to fight off infection.

Trump is 74 years old and clinically obese, putting him at higher risk of serious complications.

First lady Melania Trump has remained at the White House as she recovers from her own bout with the virus.

Many in the White House are also shaken and scared — nervous that they have been exposed to the virus and confronting the reality that what seemed like a bubble of safety has become a COVID-19 hot spot. It took until late Sunday for the White House to send a generic note to staffers suggesting they not come to the building if they do not feel well.

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Peoples reported from New York. Miller reported from Washington. Associated Press writers Lauran Neergaard, Jonathan Lemire and Aamer Madhani in Washington, and Bill Barrow in Wilmington, Del., and Marilynn Marchione in Milwaukee contributed to this report.