"And we will very genlty take that kit, and slowly toss it, hoping it doesn't injure her arm, and we will say: I will give you a million dollars to your favorite charity, paid for by Trump, if you take the test and it shows you're an Indian".
The Globe said Warren provided the test results to the paper Sunday "in an effort to defuse questions about her ancestry that have persisted for years".
He concluded Warren's ancestry is mostly European but says "the results strongly support the existence of an unadmixed Native American ancestor".
At the same time, the report could embolden critics by showing only trace amounts of that heritage - which Republicans have charged she used to advance her career at Harvard.
Bustamante was careful to say that his lab is "confident it is not an error", to say Warren has Native American ancestry, but the imprecision of genetic testing will no doubt soon be a subject of national debate should the senator run for the presidency.
That's consistent with the Massachusetts Democrat's family lore from her Oklahoma upbringing that her great-great-great-grandmother, O.C. Sarah Smith, was partially Native American.
"Now, the president likes to call my mom a liar", Warren asks him. Warren has said she will take a "hard look" at running against Mr. Trump in 2020. A series of law school administrators and professors who took part in her hiring repeatedly dismiss that claim as nonsense, just as they did in a comprehensive debunking of the falsehood published last month by The Boston Globe, which was given access to Warren's personnel files. "What do the facts say?"
Trump has mocked Warren for years, calling her "Pocahontas" as a way to denigrate her claims of Cherokee heritage.
Sen. Elizabeth Warren, who President Trump mocks as "Pocahontas," released a DNA test that shows "strong evidence" she had Native American in her family tree going back generations, according to a report on Monday.
During a town hall meeting on September 29 in Holyoke, Warren said that she plans on taking a "hard look" at running for president in 2020 following the midterm elections on November 6.
Bustamante replies: "The facts suggest that you absolutely have Native American ancestry in your pedigree".
The release of the DNA findings appear to be a way for Warren, who is expected to run for president in 2020, to put the issue at rest and remove a talking point from her opponents.
Warren tweeted. "I remember - and here's the verdict. I know it. Other people who work with her know it."=.