US President Donald Trump [Photo: Courtesy]

US President Donald Trump has claimed he may be immune to Covid-19, in a deeply unhinged message filmed minutes after he checked out of hospital. The President was admitted on Friday, being treated for coronavirus with steroids, antibiotics and a string of cutting-edge therapies - many of which are unavailable to regular Americans.

But he checked himself out of Walter Reed military hospital on Monday evening, staging an elaborate arrival at the White House. Then, in a video filmed on the Blue Room balcony, the President claimed the virus, which has killed 210,000 Americans, is really nothing to worry about.

He suggested his apparently quick recovery from the disease could be because he is "immune" to it. And he indicated he was aware of the risks of his return to the White House carrying the contagious and deadly disease but said: "That's OK."

The Republican leader has faced fresh backlash for removing his mask when he returned to presidential residence and making light of the deadly disease. William Schaffner, a professor of preventive medicine and infectious diseases at Vanderbilt University Medical Center in Nashville, was quick to remind America of the power of the virus.

Also read: Obama's message to Trump after he tested positive for Covid-19

"This is a disease that is killing around a thousand people a day, has torpedoed the economy, put people out of work. This is a virus that should be both respected and feared," he said.

Democrats also weighed in. "This is a tragic failure of leadership," Democratic Senator Chris Coons tweeted. Trump arrived home in a made-for-television spectacle in which he descended from his Marine One helicopter wearing a white surgical mask only to remove it as he posed, saluting and waving, on the mansion's South Portico.

Following the publication of President Trump's statement, his Democratic opponent Joe Biden simply tweeted: "Listen to the scientists." Trump said: "I just left Walter Reed medical centre, and it's something really very special.

"The doctors, the nurses, the first responders. And I learned so much about coronavirus. And one thing that's for certain. Don't let it dominate you. Don't be afraid of it.

"You're going to beat it. We have the best medical equipment. We have the best medicines. All developed recently." He went on: "You're going to beat it. I went, I didn't feel too good. And two days ago, I could have left two days ago. I felt great, like better than I have in a long time.

"I said just recently, better than 20 years ago. Don't let it dominate. Don't let it take over your lives. Don't let that happen. We're the greatest country in the world. We're going back. We're going back to work. We're going to be out front."

President Trump suggested he "had to" leave hospital because he is a leader. He said: "As a leader, I had to do that. I know there's a danger to it, but I had to do it. "I stood out front. I led. Nobody that's a leader would not do what I did. I know there's a risk. There's a danger. But that's OK. And now I'm better."

Also read: Trump risks infecting White House staff by taking off mask

It's at this point in the video that he suggests he is immune to the disease, for which he tested positive and suffered symptoms last week. He said: "And maybe I'm immune. I don't know. But don't let it dominate your life. "Get out there. Be careful. We have the best medicines in the world, and it all happened very shortly. And they're all getting approved. And the vaccines are coming momentarily."