WASHINGTON (AP) — President Donald Trump and his administration kept up their out-sized promotion Monday of an anti-malaria drug not yet officially approved for fighting the new coronavirus, even though scientists say more testing is needed before it’s proven safe and effective against COVID-19.

Trump trade adviser Peter Navarro championed hydroxychloroquine in television interviews a day after the president publicly put his faith in the medication to lessen the toll of the coronavirus pandemic.

“What do I know, I’m not a doctor,” Trump said Sunday. “But I have common sense.” In promoting the drug’s possibilities, the president has often stated, “What have you got to lose?”

Trump held out promise for the drug as he grasps for ways to sound hopeful in the face of a mounting death toll and with the worst weeks yet to come for the U.S. The virus has killed more than 10,600 in the U.S., and measures meant to contain its spread have taken a painful economic toll and all but frozen life in large swaths of the country.

But medical officials warn that it’s dangerous to be hawking unproven remedies, and even Trump’s own experts have cautioned against it.