Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) will unleash a new attack on Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE in a speech on Thursday, according to multiple reports, calling the presumptive Republican presidential nominee a "fraud."

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Warren, who has emerged as the left's most outspoken critic of Trump, plans on calling Trump “a loud, nasty thin-skinned fraud” who engaged in “racism” by attacking Judge Gonzalo Curiel, who is presiding over lawsuits against Trump University.

Leaked excerpts of a speech she will give to the American Constitution Society show that Warren will also target the GOP.

“Donald Trump chose racism as his weapon, but his aim is exactly the same as the rest of the Republicans,” Warren will say. “Pound the courts into submission to the rich and powerful.”

Warren and Trump have engaged in Twitter spats in the past, with Trump routinely calling her “goofy” and referring to her as “Pocahontas,” a mocking jab at her claims to Native American heritage.