Sen. Elizabeth Warren has taken the extraordinary step of releasing DNA test results that provide “strong evidence” that she has Native American ancestry, the Boston Globe reports. The possible Democratic presidential contender for 2020 has been repeatedly mocked by Donald Trump and other Republicans over her ancestral claims—one of Trump’s sick jokes is to call Warren “Pocahontas.” The Globe reports Warren said she wanted to eliminate questions about her ancestry and plans to release the results far and wide Monday. The analysis of Warren’s DNA was reportedly done by Carlos D. Bustamante, a Stanford University professor, and shows that she had a Native American in her family tree dating back six to 10 generations.