“I’m going to get one of those little kits, and in the middle of the debate, when she proclaims that she’s of Indian heritage because her mother says she has high cheekbones, we will take that little kit,” Trump said at a rally in July. “But we have to do it gently because we’re in the Me Too generation, so we have to be very gentle.”

Warren seized on the proposition, asking the president to donate the $1 million to the National Indigenous Women’s Resource Center, a nonprofit that seeks to protect Native American women from violence. She also reminded him that he still hasn’t released his tax returns. “What are YOU hiding?” she tweeted at Trump.

Warren’s campaign released a video Sunday featuring interviews with many of Warren’s former bosses and colleagues, all of whom assert that her heritage never played a role in her hiring. The White House had previously said Warren had used her background as a way of advancing her career.

In the video, Warren also denounced Trump’s purposes for continuing to elevate the issue.

“Trump can say whatever he wants about me, but mocking Native Americans or any group in order to try and get at me ― that’s not what America stands for,” Warren said.

This article has been updated with Warren’s tweet to Trump.

CORRECTION: A previous version of this article cited The Boston Globe’s erroneous math about Warren’s ancestry and has been updated to reflect the Globe’s correction. If Warren is 10th-generation Native American, that makes her 1/1,024 Native.