WASHINGTON—President Trump said he has been taking hydroxychloroquine, an antimalarial drug that he has cited as a possible treatment for the novel coronavirus but that some scientists have cautioned needs further study and could be harmful.

“I happen to be taking it, hydroxychloroquine,” he told reporters Monday. President Trump said he was taking hydroxychloroquine after asking the White House doctor if he could take it. President Trump said he doesn’t have Covid-19 and has been checked regularly but has tested negative….

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