Sen. Elizabeth WarrenElizabeth WarrenThe private alternative to the National Flood Insurance Program  Warren: 'I'd be very glad' for Sessions to quit Warren gives Trump an 'F' on draining the swamp MORE (D-Mass.) has a warning for President Trump: “Donald, you ain’t seen nasty yet.”

Warren read aloud from her new book “This Fight is Our Fight: The Battle to Save America’s Middle Class” and took questions at a town hall event in New York Friday, HuffPost reported.

Warren blasted Trump for his economic policies, saying they are hurting the middle-class Americans who voted for him.

“What Donald TrumpDonald TrumpOvernight Cybersecurity: DOJ takes down two online criminal markets | Kansas breach exposed 5M Social Security numbers OPINION | Trump's chaos, mixed messages more dangerous than his policies   Special counsel looking into possible money laundering by Manafort: report MORE and the Republican majority in the House and the Senate want to do to us, is they want to deliver the knockout blow to the middle class,” she said.

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She also hit him on women's rights, saying that "women's rights are not up for grabs" during the reading.

“The character of a nation is not the character of its president,” Warren said. “The character of a nation is the character of its people.”

--This report was updated on June 18 at 7:13 a.m.