WASHINGTON (AP) — President Donald Trump said Monday that he is taking a malaria drug to protect against the new coronavirus, despite warnings from his own government that it should only be administered for COVID-19 in a hospital or research setting due to potentially fatal side effects.

Trump spent weeks pushing the drug as a potential cure or prophylaxis for COVID-19 against the cautionary advice of many of his administration’s top medical professionals.

The Food and Drug Administration warned health professionals last month that the drug should not be used to treat COVID-19 outside of hospital or research settings, due to sometimes fatal side effects.

Trump has repeatedly pushed the use of the drug with or without the antibiotic azithromycin, but no large, rigorous studies have found them safe or effective for preventing or treating COVID-19.

In April, the National Institutes of Health launched a study testing hydroxychloroquine versus a placebo drug in 500 hospitalized COVID-19 patients.