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KEY POINTS Billionaire investment banker Lloyd Blankfein takes a swipe at Democratic presidential candidate Elizabeth Warren.

Blankfein was responding directly to Warren's most recent campaign ad, which takes aim at him and other billionaires who have blasted her rhetoric and policies.

"Maybe tribalism is just in her DNA," Blankfein says in an apparent dig at Warren's much-criticized claims of Native American ancestry.

Lloyd Blankfein, then chairman and chief executive officer of Goldman Sachs Group Inc., smiles during a discussion at the Goldman Sachs 10,000 Small Businesses Summit in Washington, D.C., U.S., on Tuesday, Feb. 13, 2018. Andrew Harrer | Bloomberg | Getty Images