"I take a pill every day," he said, adding that he combines this with zinc.
Asked why, he said: "Because I think it's good. I've heard a lot of good stories."
Trump has shown interest for weeks in promoting the use of hydroxychloroquine, even if some doctors think it does not work for coronavirus patients and US government regulators warn it has "not been shown to be safe."
House Speaker Nancy Pelosi said it's "not a good idea" for Trump to be taking the drug as a potential treatment for the coronavirus.