Highlights from Senate vote to confirm Ketanji Brown Jackson

The Senate Judiciary Committee took a 30-minute break for lunch as Judge Jackson undergoes another round of all-day questions.

ABC News Senior Washington Reporter Devin Dwyer, reporting from inside the hearing room, characterized Jackson's demeanor on Wednesday as "emotive, confident and tough."

Though she told the committee in her opening that she hadn't had much sleep, she has been frequently gesturing, flashing a smile, and a roll of the eyes, appearing more comfortable in her seat.

Several of her former clerks told Dwyer that Wednesday's performance is the "real Ketanji."

Sen. Mike Lee, R-Utah, tried to get Judge Jackson to give her opinion on whether to expand the Supreme Court, but as she has previously, Jackson refused to enter the debate and called it a "political question," not a judicial one.

"It couldn't and would never come before you," Lee said. "Last night when you were asked a question by my colleague, Senator Kennedy, on this, you acknowledged that you have an opinion -- did I understand that right? You have an opinion on court-packing?"

"Senator, I have a lot of opinions," Jackson replied. "I'm a human being, and I have an opinion on a lot of things. The reason why, in my view, it is not appropriate for me to comment is because of my fidelity to the judicial role. I understand it's a political question and that is precisely why I think that I am uncomfortable speaking to it."

Lee repeated that the issue wouldn’t go before the court and said her perspective on it would be "valuable," before moving on.

Senate Majority Leader Chuck Schumer, who was a longtime member of the Senate Judiciary Committee, sat down at the gallery behind Judge Jackson on Wednesday afternoon to witness Biden's nominee in action.

Welcoming him to the room, Chairman Sen. Dick Durbin, D-Ill., said that Schumer "would report, if he could, that we have a challenge to finish our hearing today at a time when we can go to the floor for a series of votes which will end the day" -- in a sign the hearings were entering the homestretch.

In earlier floor remarks, Schumer praised Jackson for what he called a "master class" before the Senate Judiciary Committee and said he expects her to "reach final confirmation" before the end of the work period, which would keep Democrats on track to meet their goal of confirmation before Easter.

"At times the judge also displayed one of her greatest traits: her grace and poise, even when Republicans asked intentionally misleading questions," Schumer said on the Senate floor. "Republicans tried to land a blow but judge Jackson kept her cool."

Inside the hearing room, Jackson's family was also seated behind her, as they've been in the proceedings days, to support her through the confirmation process. Her husband, Patrick, a general surgeon, was again spotted taking copious notes and donning John F. Kennedy-themed socks, after sporting a Benjamin Franklin-themed pair Tuesday.

-ABC News' Trish Turner and Allison Pecorin

Sen. John Cornyn, R-Texas, tried to draw Judge Jackson into a discussion that appeared aimed at whether the 1973 Roe v. Wade decision legalizing abortion nationwide could be overturned by the Supreme Court, to which Jackson avoided by noting it's a question currently before the court involving another case.

"What does viability mean when it comes to an unborn child in your understanding?" he asked.

"Senator, I hesitate to speculate. I know that it is a point in time that the court has identified in terms of when -- the standards that apply to regulation of the right," she said.

"No one suggests that a 20-week-old fetus can live independently outside the mother’s womb, do they?" Cornyn asked.

"Senator, I’m not a biologist," she replied.

"What I know is that the Supreme Court has tests and standards that it's applied when it evaluates regulation of the right of a woman to terminate their pregnancy," she said. "The court has announced that there is a right to terminate, up to the point of viability, subject to the framework of Roe, and there is a pending case that is addressing these issues."

Cornyn went on to have her confirm that the Constitution does not mention the words "abortion" or "marriage," after taking issue with the court’s decision on same-sex marriage on Tuesday.

Questioned also about the decision in District of Columbia v. Heller, which ruled the Second Amendment protects an individual's right to keep a gun in the home, Jackson resisted ranking the precedent with that of Roe v. Wade, as Cornyn asked her to do, and said that all Supreme Court precedents are entitled to respect on an equal basis.

-ABC News' Trish Turner