President Donald Trump suggested the possibility of an “injection” of disinfectant into a person infected with the coronavirus as a deterrent to the virus during his daily briefing Thursday.

Trump made the remark after Bill Bryan, who leads the Department of Homeland Security’s science and technology division, gave a presentation on research his team has conducted that shows that the virus doesn’t live as long in warmer and more humid temperatures. Bryan said, “The virus dies quickest in sunlight,” leaving Trump to wonder whether you could bring the light “inside the body.”

“So supposing we hit the body with a tremendous — whether it’s ultraviolet or just a very powerful light — and I think you said that hasn’t been checked because of the testing,” Trump said, speaking to Bryan during the briefing. “And then I said, supposing you brought the light inside the body, which you can do either through the skin or some other way, and I think you said you’re going to test that, too.”

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He added: “I see the disinfectant that knocks it out in a minute, one minute. And is there a way we can do something like that by injection inside or almost a cleaning? As you see, it gets in the lungs, it does a tremendous number on the lungs, so it would be interesting to check that.”

He didn’t specify the kind of disinfectant.

Medical professionals, including Dr. Vin Gupta, a pulmonologist, global health policy expert and an NBC News and MSNBC contributor. were quick to challenge the president’s “improper health messaging.”

“This notion of injecting or ingesting any type of cleansing product into the body is irresponsible and it’s dangerous,” said Gupta. “It’s a common method that people utilize when they want to kill themselves.”

The president has repeatedly touted unproven treatments during the daily briefings on COVID-19, the disease associated with the coronavirus. For instance, he has touted hydroxychloroquine as a potential “game changer,” but health officials have strongly cautioned against it.