President Donald Trump wears a face mask as he walks down a hallway during a visit in Bethesda, Maryland. AP

President Donald Trump finally yielded to pressure and wore a face mask in public for the first time on Saturday as the US posted another daily record for coronavirus cases, while Disney World reopened in a state hit hard by the pandemic.

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White House experts leading the national fight against the contagion have recommended wearing face coverings in public to prevent transmission of the illness.

But Trump had repeatedly avoided wearing a mask, even after staffers at the White House tested positive for the virus and as more aides have taken to wearing them.

Logo of the World Health Organization. File photo

Hours after the World Health Organization urged countries to step up control measures to rein in the disease, Trump donned a dark mask bearing the presidential seal as he visited wounded military veterans at the Walter Reed military hospital in a suburb outside Washington.

"I've never been against masks but I do believe they have a time and a place," he told reporters as he left the White House.

Trump is trailing Democrat Joe Biden in the polls ahead of a November election and surveys show most Americans are unhappy with how he has handled the public health crisis.

But the president has continued to praise his own response to the pandemic despite a cascade of figures showing the extent of the disease's spread across the United States.

The country posted yet another daily record of confirmed cases on Saturday night, with 66,528 new infections, while the death toll rose by almost 800 to nearly 135,000.

Agence France-Presse