Washington (CNN) Supreme Court nominee Brett Kavanaugh on Thursday combatively responded to questions from Sen. Amy Klobuchar about his drinking habits.

Kavanaugh's drinking as a high school and college student has become a line of questioning in a hearing about sexual assault allegations made against him. The Minnesota Democrat addressed her father's own struggle with alcoholism during the Senate Judiciary Committee hearing, including the fact that her father still attends Alcoholics Anonymous as age 90 to combat his struggle. She then asked Kavanaugh if he had ever drank so much he "didn't remember what happened the night before or part of what happened."

"You're asking about blackout, I don't know, have you?" he responded.

"Could you answer the question, judge?" Klobuchar said, looking somewhat surprised by the response. "So, you have, that's not happened? Is that your answer."

"Yeah, and I'm curious if you have," he added.

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