"Goofy Elizabeth Warren, who may be the least productive Senator in the U.S. Senate, must prove she is not a fraud," Trump tweeted. "Without the con it's over."

Goofy Elizabeth Warren, who may be the least productive Senator in the U.S. Senate, must prove she is not a fraud. Without the con it's over — Donald J. Trump (@realDonaldTrump) July 17, 2016

I hope that Crooked Hillary picks Goofy Elizabeth Warren, sometimes referred to as Pocahontas, as her V.P. Then we can litigate her fraud! — Donald J. Trump (@realDonaldTrump) July 17, 2016

If Goofy Elizabeth Warren, a very weak Senator, didn't lie about her heritage (being Native American) she would be nothing today. Pick her H — Donald J. Trump (@realDonaldTrump) July 17, 2016

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Warren has been an attack dog against Trump for several months, often slamming him in series of tweets.

Trump commonly calls the Massachusetts senator Pocahontas, referencing the senator's claims of Native American heritage.