Trump's doctors have said his health is improving and he could be discharged on Monday. File photo

US President Donald Trump said he will leave the U.S. military hospital where he was being treated for COVID-19 later on Monday, adding that he felt "really good."

"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. Don’t let it dominate your life. We have developed, under the Trump Administration, some really great drugs & knowledge. I feel better than I did 20 years ago!" he said on Twitter.

The virus has killed nearly 210,000 Americans.

Trump has been treated at Walter Reed National Military Medical Center since Friday afternoon.

Trump’s return comes as the White House is still learning of the scale of the apparent outbreak on the complex last week. Press secretary Kayleigh McEnany tested positive for the coronavirus Monday morning.

Trump sent a number of all-caps tweets Monday morning encouraging supporters to vote, with just weeks until Election Day. But he hasn’t yet appeared in photos or videos released by the White House on Monday.

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"It's a very interesting journey. I learned a lot about COVID," he said in a video posted to Twitter on Sunday.

A return to the White House might help Trump project a sense of normalcy as he faces a difficult re-election battle against Democrat Joe Biden.

US Democrat candidate Joe Biden talks during an event. File photo

A Reuters/Ipsos poll released on Sunday showed Trump trailing Biden by 10 percentage points. About 65 percent of Americans said Trump would not have been infected had he taken the virus more seriously.

Trump's doctors have said his health is improving and he could be sent back to the White House as soon as Monday.

Yet they are treating Trump, 74, with a steroid, dexmethasone, that is normally used only in the most severe cases. He is also just two days into a five-day course of an intravenous antiviral drug, remdesivir.

Dr. Sean P. Conley, the White House physician, said on Sunday that Trump's condition had been worse than he had previously admitted. Conley said Trump had run a high fever on Friday morning and he had been given supplemental oxygen after his blood oxygen levels had dropped.

Doctors not involved in Trump's treatment said they suspected his condition might be worse than Conley let on. As an overweight, elderly man, Trump is in a category that is more likely to develop severe complications or die from the disease.

Trump has consistently downplayed the risks of the pandemic since it first emerged this year, and he has repeatedly flouted social-distancing guidelines meant to curb its spread.