Sen. Elizabeth Warren, who has previously claimed tribal ancestry, publicly apologized for "the harm I have caused" during her speech Monday at the Frank LaMere Native American Presidential Forum in Sioux City, Iowa.

Warren, who's been surging in 2020 Democratic primary polls in recent months, opened her speech at a forum organized by a group fighting for Native American voting rights with an apology and was greeted with a warm reception. She didn't directly reference the controversy over the DNA test results released last year to prove her ancestry.

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