President Donald Trump has "persistently mocked" Warren for her assertions of Native American ancestry. At a July 2018 Montana rally, Trump promised that if he debated Warren, he would offer to pay $1 million to her favorite charity if she could prove her Native American ancestry via a DNA test. Warren released results of a DNA test in October 2018, then asked Trump to donate the money to the National Indigenous Women's Resource Center. Trump responded by denying that he had made the challenge. The DNA test found that Warren's ancestry is mostly European but "strongly support the existence of an unadmixed Native American ancestor", likely "in the range of 6 to 10 generations ago." The Cherokee Nation criticized the use of DNA testing to determine Native American heritage as "inappropriate and wrong". According to "Politico", "Warren's past claims of American Indian ancestry garnered fierce criticism from both sides of the aisle, with President Donald Trump labeling her with a slur, "Pocahontas", and tribal leaders calling out Warren for claiming a heritage she did not culturally belong to."