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Ex-NAACP leader Rachel Dolezal: 'No biological proof' her white parents are her mother, father

In this image released by NBC News, former NAACP leader Rachel Dolezal appears on the "Today" show set on Tuesday, June 16, 2015, in New York. Dolezal was born to two parents who say they are white, but she chooses instead to self-identify as black. Her ability to think she has a choice shows a new fluidity in race in a diversifying America, a place where the rigid racial structures that defined most of this country’s history seems, for some, to be falling to the wayside. (Anthony Quintano/NBC News via AP)

In this image released by NBC News, former NAACP leader Rachel Dolezal appears on the "Today" show set on Tuesday, June 16, 2015, in New York. Dolezal was born to two parents who say they are white, but she chooses instead to self-identify as black. Her ability to think she has a choice shows a new fluidity in race in a diversifying America, a place where the rigid racial structures that defined most of this country‚Äôs history seems, for some, to be falling to the wayside. (Anthony Quintano/NBC News via AP)  (The Associated Press)

The woman who resigned as president of the Spokane NAACP after her parents revealed she was white posing as black says there's no proof they are her mother and father.

In an interview with NBC News on Tuesday night (http://nbcnews.to/1LfaDYU ), Rachel Dolezal said she hasn't had a DNA test and there's no "biological proof" that Larry and Ruthanne Dolezal are her parents.

NBC's Savannah Guthrie pointed out there's a birth certificate that lists the Dolezals as her parents.

Rachel Dolezal responded that she can't prove her parentage one way or another.

The uproar over her racial identity began last week after her parents said their daughter was white. For years, she publicly described herself as black or partly black and said on NBC's "Today" show that she identifies as black.