Twitter has temporarily suspended Republican lawmaker Marjorie Taylor Greene for posting “misleading” information about coronavirus.
The social media platform said her account would be in “ready-only mode” for 12 hours.
Greene, a Republican congresswoman, has been an outspoken critic of vaccines and the use of masks.
Last month she apologised for likening coronavirus mask rules to the treatment of Jews in Nazi Germany.
In two tweets on Monday, Greene argued that vaccines should not be required, and that Covid was not dangerous for people under 65 who are not obese.
Both posts are still on display, but have been tagged by Twitter as “misleading”.
Greene was suspended on Twitter in April, but the company later rescinded the ban, saying it was a mistake caused by its automated moderation system.
Responding to her latest suspension, Greene said Silicon Valley firms were attacking free speech with support from the White House.
“These Big Tech companies are doing the bidding of the Biden regime to restrict our voices and prevent the spread of any message that isn’t state-approved,” she said in a statement to the New York Times.
Last week, US President Joe Biden urged social media firms to take more action against the spread of false information on their platforms about coronavirus and vaccines.
“They’re killing people,” Mr Biden told reporters. “The only pandemic we have is among the unvaccinated.”