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The 74-year-old assured the public of his progress hours after a source with knowledge of the president's condition had warned his vital signs were worrying, with the next 48 hours critical.
"We have monitored his cardiac function, his kidney function, liver function. All of those are normal," Sean Dooley, member of Trump's medical team said, as quoted by agencies.
"I came here, wasn't feeling so well," said Trump, who is being treated at Walter Reed military medical center near Washington following his Covid-19 diagnosis.
"I feel much better now, we're working hard to get me all the way back."
The president was put on supplemental oxygen on Friday after his oxygen levels dropped, which in part prompted the decision to airlift him to the Walter Reed Military Medical Center in Bethesda, in the adjoining state of Maryland.
The president sought to portray his hospitalization as a courageous decision. “I had no choice because I just didn’t want to stay in the White House,” Trump said. “I was given that alternative. Stay in the White House, lock yourself in, don’t ever leave, don't even go to the Oval Office. Just stay upstairs and enjoy it. Don’t see people don’t talk to people and just be done with it.
“I can’t do that, I had to be out front,” he added. “We have to confront problems. As a leader you have to confront problems there’s never been a great leader that would have done that.”
The president sounded eager to return to the campaign trail and said he hoped to be “back soon” and looked forward to “finishing up the campaign, the way it was started, and the way we’ve been doing the kind of numbers that we’ve been doing”.
Trump, in fact, was trailing Joe Biden, his Democratic rival, by a wide margin in national polls and has failed to narrow the gap despite his best efforts to portray Biden mentally unsuitable for the job, and being weak on law and order and “Trojan Horse” for the Democratic party’s progressives.
Trump, who showed "mild symptoms" of COVID-19, was flown to Walter Reed Military Medical Centre in Bethesda, a Maryland suburb of Washington DC, on Friday. Trump walked from his residence to take Marine One at the South Lawns of the White House to travel to Walter Reed hospital.
Trump, 74, and his wife First Lady Melania Trump, 50, tested positive for COVID-19 on Friday. "Going well, I think! Thank you to all. LOVE!!! Trump tweeted on Saturday morning.