Twitter labeled two of President Donald Trump’s tweets with a fact-check warning on Tuesday for the first time, prompting the president to accuse the platform of “stifling free speech.”

The social media platform applied the tag on two of Trump’s tweets that made claims, without evidence, that voting with mail-in ballots would be “substantially fraudulent.” The labels say “Get the facts about mail-in ballots” and direct users to a collection of news reports and articles debunking the tweets.

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