Twitter places fact-check notification on Trump tweet about mail-in ballots

Twitter on Tuesday for the first time prompted readers to check the facts in tweets sent by U.S. President Donald Trump, warning readers his claims about mail-in ballots were false and had been debunked by fact checkers.

The blue exclamation mark notification prompted readers to "get the facts about mail-in ballots" and directed them to a page with news articles and information from fact-checkers about the claims. "Trump makes unsubstantiated claim that mail-in ballots will lead to voter fraud," a headline at the top of the page said.

Trump had claimed in tweets earlier in the day that mail-in ballots would be "substantially fraudulent" and result in a "rigged election." He also singled out the governor of California over the issue, although the state is not the only one to use mail-in ballots. Twitter confirmed this was the first time it had applied a label to a tweet by the president under its new "misleading information" policy, introduced earlier in the month.