Twitter has labelled two of twets by US President Donald Trump as unsubstantiated for the first time.

The move was made in response to two Trump tweets over the past 24 hours. The tweets falsely claimed that mail-in ballots are fraudulent. Twitter’s label says, “Get the facts about mail-in ballots,” and redirects users to news articles about Trump’s unsubstantiated claim.
There is NO WAY (ZERO!) that Mail-In Ballots will be anything less than substantially fraudulent. Mail boxes will be robbed, ballots will be forged & even illegally printed out & fraudulently signed. The Governor of California is sending Ballots to millions of people, anyone…..
— Donald J. Trump (@realDonaldTrump) May 26, 2020
The tweets, said Twitter spokeswoman Katie Rosborough, “contain potentially misleading information about voting processes and have been labeled to provide additional context around mail-in ballots.”
The label directs users to articles by CNN, The Washington Post and the Hill, along with selections from the articles and a page summarizing the findings of fact-checkers.
Twitter’s action quickly drew backlash from Trump and his supporters. Twitter “is now interfering in the 2020 Presidential Election,” the president tweeted. “They are saying my statement on Mail-In Ballots, which will lead to massive corruption and fraud, is incorrect, based on fact-checking by Fake News CNN and the Amazon Washington Post.”