Sen. Elizabeth Warren (D-Mass.) hit back at President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Tuesday after he criticized her for attempting to substantiate her claim of Native American heritage by releasing the results of a DNA test, saying that the president has "lost a step" and is "going to lose Congress."

"Millions of people watched you, @realDonaldTrump, as you fumbled and lied on your $1 million pledge. It then took a day for your handlers to tee up this recycled racist name-calling. You’ve lost a step, and in 21 days, you’re going to lose Congress," Warren tweeted Tuesday morning.

Earlier Tuesday, Trump criticized Warren, calling her "phony" and saying that she took a "bogus" DNA test. He once again deridingly used the term "Pocahontas" to refer to the Massachusetts senator.

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"Pocahontas (the bad version), sometimes referred to as Elizabeth Warren, is getting slammed. She took a bogus DNA test and it showed that she may be 1/1024, far less than the average American. Now Cherokee Nation denies her, 'DNA test is useless.' Even they don’t want her. Phony!" he tweeted.

Warren on Monday released the results of a DNA test, the results of which Stanford University professor Carlos Bustamante said "strongly support" Warren's Native American ancestry. The results show Warren is anywhere from 1/32nd to 1/1,024th Native American, the Boston Globe reported Monday.

Trump on Monday also denied offering Warren $1 million for a charity of her choice if she took such a test, even though he did so during a July campaign rally.

The Cherokee Nation on Monday responded to Warren's release of her DNA test results, calling the move "inappropriate" and "wrong," and saying the test "makes a mockery out of DNA tests and its legitimate uses while also dishonoring legitimate tribal governments and their citizens."