During Thursday's White House coronavirus task force briefing, an official presented the results of US government research that indicated coronavirus appeared to weaken more quickly when exposed to sunlight and heat.
The study also showed bleach could kill the virus in saliva or respiratory fluids within five minutes and isopropyl alcohol could kill it even more quickly.
"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."
Doctors warned the president's idea could have fatal results.
Kashif Mahmood, a doctor in Charleston, West Virginia, tweeted: "As a physician, I can't recommend injecting disinfectant into the lungs or using UV radiation inside the body to treat COVID-19.
Bill Bryan, the acting undersecretary of science and technology for the Department of Homeland Security, explained during the briefing that new experiments show the coronavirus does not fare well under sunlight or heat, the President suggested that Americans who have the virus could treat it by going out into the sunlight on a hot day.
An Arizona man died in late March after having ingested chloroquine phosphate — believing it would protect him from becoming infected with the coronavirus. The man's wife told NBC News that she had watched televised briefings during which Trump talked about the potential benefits of chloroquine.