President Trump on May 18 said that he has been taking the anti-malarial drug hydroxychloroquine as a preventive measure against the coronavirus. (Video: The Washington Post)

President Trump announced Monday that he is taking the drug hydroxychloroquine as protection against the novel coronavirus, despite the lack of evidence that it prevents individuals from contracting the illness and warnings from physicians that it can have deadly side effects.

The president said he began taking the anti-malaria drug about 10 days ago after he told the White House physician he would like to start taking hydroxychloroquine. That timing would put the start of Trump’s drug regimen at roughly the same time as news broke that two White House staffers had tested positive for the virus, and the White House later released a letter from Trump’s in-house doctor that linked his drug regimen to one of those cases.