Describing himself as a “wartime president”, President Donald Trump has vowed the US will achieve “total victory” over the coronavirus.
He spoke as he revived a Korean War-era measure allowing the US to ramp up production of vital medical supplies.
Two lawmakers meanwhile became the first members of Congress to test positive for the infection.
The US has more than 9,300 cases of Covid-19 and has seen 150 deaths so far, according to estimates.
Globally there are some 220,000 confirmed cases and over 8,800 deaths.