During his questioning, Leahy, who has participated in 20 Supreme Court confirmation battles over nearly half a century serving in the Senate, predicted the outcome of the Jackson hearings.

"You will become a member of the U.S. Supreme Court," he told her.

A White House official said they're pleased with her performance, adding that Jackson did "incredibly well for over 20 hours and withstood many antics." The official said they still believe "we're on track for a timely confirmation."