Supreme Court nominee Brett Kavanaugh apologized on Thursday after tangling with Democratic Sen. Amy Klobuchar over his drinking in high school.

The senator from Minnesota asked Kavanaugh on Thursday about his drinking habits during a hearing on sexual assault allegations. Christine Blasey Ford says Kavanaugh was drunk at the time he sexually assaulted her.

Klobuchar said Kavanaugh wrote in testimony that he sometimes had too many drinks. Klobuchar asked whether he ever drank so much that he couldn’t remember what happened or part of what happened the night before. Kavanaugh answered “no.”

In a back-and-forth, he added, “Have you?” and followed up a second time.

Klobuchar said: “I have no drinking problem, Judge.” Kavanaugh responded: “Nor do I.”

After returning from a break, he apologized for asking her that question.