Warren has been trying for the past year to get past the lingering controversy over her past assertion that she is Native American.

In addition to the DNA test, she released employment documents over the summer to show she didn’t use ethnicity to further her career. And in a speech a year ago she addressed her decision to call herself a Native American, though she didn’t offer the apology that some wanted at the time.

But as Warren undergoes increased scrutiny as a presidential candidate, additional documents could surface to keep the issue alive.