As the virus spread, private briefings from the Trump administration fueled a stock sell-off.

On the afternoon of Feb. 24, President Trump declared on Twitter that the coronavirus was “very much under control” in the United States, but hours earlier, senior members of the president’s economic team, privately addressing board members of the conservative Hoover Institution, were less confident.

source https://www.nytimes.com/2020/10/15/world/as-the-virus-spread-private-briefings-from-the-trump-administration-fueled-a-stock-sell-off.html