WATCH: Voter confronts Elizabeth Warren over her DNA test. Warren's response is mind-boggling.

While stumping in Iowa on Saturday, Sen. Elizabeth Warren (D-Mass.), who this week formed an exploratory committee for president, was forced to address the results of her infamous DNA test from last fall when a voter confronted her about her motives behind releasing the test's results.

What happened?

"Why did you undergo the DNA testing and give Donald Trump more fodder to be a bully?" the voter asked at the Sioux City event.

"I am not a person of color," Warren responded. "I am not a citizen of a tribe. Tribal citizenship is very different from ancestry. Tribes — and only tribes — determine tribal citizenship, and I respect that difference."

Without directly answering the question, Warren transitioned into bashing Trump for "hurling racial insults." It was the first time Warren mentioned Trump by name while stumping in Iowa, and she quickly returned to her campaign message, one that advocates a "level playing field" for all Americans.

Still, Warren claimed she was "genuinely" happy to receive the question about her ancestry.

“I'm just gonna put it all out there."

Senator Elizabeth Warren explains why she took a DNA test to determine her heritage #tictocnews pic.twitter.com/dqQTpRHeXw
— TicToc by Bloomberg (@tictoc) January 5, 2019

What did the DNA test results show?

Despite claiming for most of her adult life that she is Native American, DNA test results released last October show that Warren is "between 1/64th and 1/1024th Native American."

"While the vast majority of the individual's ancestry is European, the results strongly support the existence of an unadmixed Native American ancestor in the individual's pedigree, likely in the range of 6-10 generations ago," the results declared.