In a video posted Monday online, a group of people calling themselves “America’s Frontline Doctors” and wearing white medical coats spoke against the backdrop of the Supreme Court in Washington, sharing misleading claims about the virus, including that hydroxychloroquine was an effective coronavirus treatment and that masks did not slow the spread of the virus.

The video did not appear to be anything special. But within six hours, President Trump and his son Donald Trump Jr. had tweeted versions of it, and the right-wing news site Breitbart had shared it. It went viral, shared largely through Facebook groups dedicated to anti-vaccination movements and conspiracy theories such as QAnon, racking up tens of millions of views. Multiple versions of the video were uploaded to YouTube, and links were shared through Twitter.

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