Judge Ketanji Brown Jackson, President Joe Biden’s nominee to the Supreme Court, said during her confirmation hearing Tuesday that she could not define the term “woman.”

Jackson was responding to questioning from Sen. Marsha Blackburn, a Tennessee Republican, who asked about a number of culture war issues, including efforts to permit or ban transgender student-athletes to compete on teams corresponding to their gender identity rather than their biological sex.

In the exchange, Blackburn asked Jackson, in her second day of confirmation hearings before the Senate Judiciary Committee, to define the word “woman.”

Jackson responded that she could not.

“You can’t?” Blackburn asked.

“Not in this context. I’m not a biologist,” Jackson said, adding, “In my work as a judge, what I do is address disputes. If there is a dispute about a definition, people make arguments, and I look at the law, and I decide.”