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NEW YORK, N.Y. (CBSMiami/AP) — Donald Trump is railing against Sen. Elizabeth Warren, calling the Massachusetts Democrat “goofy” as rumors abound linking her to Hillary Clinton’s candidacy for president.

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Trump told supporters in Eugene, Oregon on Friday evening that his likely rival has “got this goofy friend named Elizabeth Warren.”

Trump called Warren a “goofus” and a “basket case,” and said “she’s done nothing in the United States Senate.”

Warren had earlier put out a series of tweets aimed at Trump:

And continued to egg him on:

Trump’s Twitter account responded with: “Goofy Elizabeth Warren, Hillary Clinton’s flunky, has a career that is totally based on a lie. She is not Native American.”

Warren faced questions about her Native American ancestry during her 2012 Senate campaign after being listed as such at Harvard University.

And from there, the back-and-forth bitter Twitter battle erupted with more than a dozen posts between the two.

(TM and © Copyright 2016 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)