“Pocahontas is at it again! Goofy Elizabeth Warren, one of the least productive U.S. Senators, has a nasty mouth. Hope she is V.P. choice,” Trump tweeted Friday morning.

Pocahontas is at it again! Goofy Elizabeth Warren, one of the least productive U.S. Senators, has a nasty mouth. Hope she is V.P. choice. — Donald J. Trump (@realDonaldTrump) June 10, 2016

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Warren and Trump have been targeting each other with insults in recent weeks. Warren brought their feud to a new level Thursday, calling Trump a “ thin-skinned, racist bully ” during a speech at the American Constitution Society convention in Washington.

"Donald Trump is a loud, nasty, thin-skinned fraud who has never risked anything for anyone and who serves no one but himself," she said.

Her comments came the same day she endorsed Clinton for president, amid growing speculation that Clinton is considering Warren as her running mate.

Trump has repeatedly attacked Warren as “Pocahontas,” accusing her of claiming she was part Native American while a professor at Harvard.