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 a subsequent tweet under its new policy on misleading information.

President Trump responded by tweeting again, saying the social media giant "is completely stifling free speech".
 

Twitter's notification displays a blue exclamation mark underneath the tweets, suggesting readers "get the facts about mail-in ballots".

In his new tweets, Mr Trump accused Twitter of interfering in the US presidential election scheduled for 3 November 2020.
 

He said the social media company was "completely stifling free speech, and I, as president, will not allow it to happen".
 

Mr Trump's presidential campaign manager Brad Parscale also criticised Twitter.

"Partnering with biased fake news 'fact checkers' is a smoke screen to lend Twitter's obvious political tactics false credibility. There are many reasons we pulled all our advertising from Twitter months ago, and clear political bias is one of them,"