White House Chief of Staff Mark Meadows said he was very concerned about the health of his boss, President Trump.
Trump was found to be infected with the coronavirus last week, and his condition deteriorated rapidly on Friday.
“We were very concerned, he had a fever and his blood oxygen levels were falling rapidly,” Meadows said in an interview with US media.
Trump was transferred to a hospital outside Washington on Friday. According to the chief of staff, Trump has “an incredible improvement”.
Meadows has therefore become optimistic again on Saturday but acknowledged that “the next 48 hours or so” remains risky for the health of the US president.
Trump, according to Meadows, is “an excellent patient in the hospital, except that he keeps working and feels he has to do things for the American people.”
The White House has distributed photos of Trump working in the hospital. He is wearing a suit and behind him are the American flag and the flag with the presidential coat of arms.