Twitter fact-checks Trump tweet for the first time, calls it 'unsubstantiated' 

Twitter on Tuesday for the first time prompted readers to check the facts in tweets sent by US President Donald Trump and accused him of making false claims.

The social network has long resisted calls to censure the US president over truth-defying posts.

The move drew a furious response from Trump, who used the platform to accuse Twitter of "interfering in the 2020 Presidential Election."

"Twitter is completely stifling FREE SPEECH, and I, as President, will not allow it to happen!" he tweeted.

The social media giant targeted two tweets the president posted on Tuesday in which he contended without evidence that mail-in voting would lead to fraud and a "Rigged Election."

Under the tweets, Twitter posted a link which read "Get the facts about mail-in ballots" and which took users to a notice calling the claims "unsubstantiated", citing reporting by CNN, the Washington Post and other media.

"Trump falsely claimed that mail-in ballots would lead to 'Rigged Election'," the notice contended.

"However, fact-checkers say there is no evidence that mail-in ballots are linked to voter fraud."

Trump aimed the misleading tweets at California, contending falsely that anyone living in the state would be sent ballots when in fact they will only go to registered voters, according to the notice.

The president has long used Twitter as a platform to spread abuse, conspiracy theories, false information and insults to his 80 million followers.

(With inputs from AFP)