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Former FDA Commissioner Scott Gottlieb, who served under President Trump, told MSNBC on Wednesday that hydroxychloroquine "definitively" does not work as a coronavirus treatment.

Why it matters: Trump took the drug in May as a preventative measure against the virus and has prompted controversy by continuing to tout its efficacy despite the FDA ending its emergency use authorization.

  • Trump and his son, Donald Trump Jr., garnered more controversy this week after retweeting a viral video falsely claiming that hydroxychloroquine is a "cure" for the virus. That caused Twitter to temporarily bar Trump Jr. from tweeting or retweeting.

What he's saying: "We all hoped it was going to work. ... All of the studies that were rigorously done have pointed in the same direction, which is that the drug doesn't work," Gottlieb said.

  • "I think at this point, we can definitively say hydroxychloroquine doesn't work. I'm not sure what more we need to do."
  • "I think it's incumbent of the public health officials around the president to make sure he's fully informed of that information. ... There is a lot of data right now available that I think could inform a very convincing briefing."

Go deeper

Chris Christie tells Trump to stop inflaming and show the evidence

One of President Trump's top allies publicly rebuked him on Thursday night for failing to produce evidence to support his unfounded claims that Democrats were stealing the election from him.

Driving the news: "We heard nothing today about any evidence," former New Jersey Gov. Chris Christie said on ABC. "This kind of thing, all it does is inflame without informing. And we cannot permit inflammation without information."

Updated 52 mins ago - Sports

Swimmer Chase Kalisz first American to win Olympics gold medal

Chase Kalisz of Team United States celebrates after winning the Men's 400m Individual Medley Final on day two of the Tokyo 2020 Olympic Games at Tokyo Aquatics Centre in Tokyo, Japan. Photo: Al Bello/Getty Images

Swimmer Chase Kalisz has become the first Team United States Olympian to win gold at the Tokyo Games.

The big picture: The Rio 2016 silver medalist's winning time in the men's 400 meters Individual Medley Final was 4 minutes 9.42 seconds. His teammate Jay Litherland took silver, .86 seconds behind him.

California's largest wildfire razes homes as 88 huge blazes burn in U.S.

Firefighters on the scene as dozens of homes burn during the Dixie Fire in the Indian Falls neighborhood of unincorporated Plumas County, California, on July 24. Photo: Josh Edelson/AFP via Getty Images

Flames from California's biggest wildfire were engulfing homes in the state's north overnight — one of 88 large blazes raging in the U.S.

Driving the news: The Dixie Fire, which erupted July 14 near the origin of the deadly 2018 Camp Fire in Butte County, was tearing through the community of Indian Falls, per AP.