The president, in a marked shift from the more measured approach he's taken toward the virus in recent days, took to Twitter to promote hydroxychloroquine as a treatment for COVID-19, the disease caused by the virus, and to amplify criticism of Dr. Anthony Fauci, the nation's top infectious disease expert. In a White House briefing, Trump defended his decision to promote a viral video of a group of doctors promoting the use of the drug Monday, even though his own administration withdrew emergency authorization for its use against the coronavirus.

"I think they're very respected doctors," Trump said, adding they believed in the drug. "There was a woman who was spectacular in her statements about it." The doctors, members of a group called America's Frontline Doctors, took part in an event organized by Tea Party Patriots Action, a dark money group that has helped fund a pro-Trump political action committee.