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Despite numerous cautions from medical experts—including those on his staff—President Donald Trump continues to tout hydroxychloroquine as a promising treatment for the virus that's brought daily life in the United States to a standstill.

The drug has undergone no clinical trials to scientifically test its efficacy on the virus, and the evidence on its behalf is anecdotal at best. One Fox News guest, Access Health International Chairman William Haseltine, called it a "quack cure."

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