GOP presidential front-runner Donald TrumpDonald John TrumpTillerson: Russia already looking to interfere in 2018 midterms Dems pick up deep-red legislative seat in Missouri Speier on Trump's desire for military parade: 'We have a Napoleon in the making' MORE on Monday called Sen. Elizabeth WarrenElizabeth Ann WarrenGovernment watchdog finds safety gaps in assisted living homes David Crosby: Shared dislike for Trump could reunite Crosby, Stills, Nash and Young Dem senators tell Trump he doesn’t have ‘legal authority’ to launch preemptive strike on North Korea MORE (D-Mass.) an “Indian,” mocking her for an old claim of Native-American ancestry.

Earlier in the day, Warren went on a Twitter rant against Trump, calling him a "loser" and a "serious threat" to the United States.

“You mean the Indian?” Trump asked when a reporter inquired about the senator's comments during a press conference in Washington, D.C. “Who’s that? The Indian?”

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Trump accused Warren of inflaming tensions between everyday Americans by attacking the legitimacy of his White House run.

“The problem with this country right now is it’s so divided,” he said. "People like Elizabeth Warren really have to get their act together because it’s going to stay divided."

“That includes Hillary,” Trump continued. "And that probably includes me."

Warren met with controversy during her 2012 Senate campaign when reports emerged that Harvard Law School once touted her alleged Cherokee and Delaware ancestors as proof of its faculty’s diversity.