On Tuesday, Trump used the first televised debate with Democratic challenger Biden to amplify his baseless claims that the November 3 presidential election will be rigged.
Trump has been especially critical of mail-in ballots, and he cited a number of small unrelated incidents to argue that fraud was already happening at scale.
Facebook has been under fire for refusing to fact-check political advertisements more broadly and for rampant organic misinformation.
Citing hate speech rules, it also moved on Wednesday to remove Trumps campaign advertisements suggesting that immigrants could be a significant source of coronavirus infections.
Facebook said the new election advertisement prohibition would include those that portray voting or census participation as useless/meaningless or that delegitimise any lawful method or process of voting or voting tabulation as illegal, inherently fraudulent or corrupt.
Facebook also cited the ones that call an election fraudulent or corrupt because the result was unclear on election night or because ballots received afterwards were still being counted.
The company added that as of September 29, it has banned advertisements that praise, support or represent militarised social movements and QAnon from its platform.
QAnon followers espouse an intertwined series of beliefs, based on anonymous web postings from Q, who claims to have insider knowledge of the Trump administration.
Starting from Wednesday, Facebook will direct people to credible child safety resources when they search for certain child safety hashtags, as QAnon supporters are increasingly using the issue and hashtags such as #savethechildren to recruit, the social media company said.
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