GOP presidential front-runner Donald TrumpDonald John TrumpTrump marks 'very sad milestone' of 100K coronavirus deaths DOJ: George Floyd death investigation a 'top priority' Lifting our voices — and votes MORE on Monday called Sen. Elizabeth WarrenElizabeth WarrenLongtime Democratic pollster: Warren 'obvious solution' for Biden's VP pick The Hill's Morning Report - Presented by Facebook - US virus deaths exceed 100,000; Pelosi pulls FISA bill Warren's VP bid faces obstacle: Her state's Republican governor 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.