A post by US President Donald Trump has been given fact-check links by Twitter for the first time.
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Mr Trump tweeted, without providing evidence: “There is NO WAY (ZERO!) that Mail-In Ballots will be anything less than substantially fraudulent.”
Twitter put a warning label in the post and linked to a page that described the claims as “unsubstantiated”.
The response from the President was swift and assertive – threatening to leave the site and promising “big action to come”.
Washington correspondent David Grossman reports.
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