“Many of history’s worst authoritarians started out as losers — and [Trump] is a serious threat,” Warren wrote.

Trump responded by invoking a past controversy over Warren’s claim she has Native American heritage. “The Indian? You mean the Indian?” Trump said at a news conference Monday in Washington.

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Warren’s tweets were the latest move in her campaign to discredit Trump ahead of the Republican convention. Increasingly, the senator from Massachusetts is taking to social media to share her views on the Republican primary race. Given her wide base of progressive support, the statements quickly go viral.

Case in point: Monday’s tweet-storm was accompanied by a longer Facebook post in which Warren called Trump a threat to virtually every component of the progressive agenda. “People have been underestimating his campaign for nearly a year — and it’s time to wake up,” she wrote. Within an hour, 29,000 people had shared the post. On Twitter, her retweets were in the thousands.

Warren is making a concerted effort to take on Trump this month. Last Monday, she used Facebook to call Trump a demagogue and a “bigger, uglier threat every day.” On Thursday, she told MSNBC she takes Trump “very seriously” and said he is promoting a “form of hate.” Over the weekend, she joked that it would make for a “perfect reality-show match-up” if Trump wins the nomination and chooses Scott Brown, former senator in Massachusetts, as his running mate: “‘Celebrity Apprentice’ meets ‘The Biggest Loser.’ ”

Trump is starting to fire back. “She’s got about as much Indian blood as I have,” he said of Warren in a New York Times interview. “Her whole life was based on a fraud. She got into Harvard and all that because she said she was a minority.”

Still, Monday appears to be the first time Warren has specifically called out Trump — handle and everything — on Twitter.