Coronavirus live updates: Trump says he takes hydroxychloroquine as U.S. death toll tops 90,000

President Donald Trump on Monday said he has been taking hydroxychloroquine, an unproven treatment for COVID-19 that he has vigorously promoted. The FDA has warned the drug can cause serious heart problems.

The U.S. coronavirus death toll has topped 90,800, according to NBC News' count. More than 1.5 million cases have been confirmed in the country.Globally, more than 318,000 have died from the virus, according to Johns Hopkins University data. The number of deaths in the U.S. is expected to hit 100,000 by June 1, according to Robert Redfield, the director of the Centers for Disease Control and Prevention.

On Monday, China pledged an extra $2 billion to deal with the coronavirus crisis at the World Health Assembly, which was held virtually. U.S. Secretary of Health and Human Services Alex Azar said that the World Health Organization's "failure cost many lives and it must not happen again."

Here's what to know about the coronavirus, plus a timeline of the most critical moments:

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