Sen. Dianne Feinstein, D-Calif., the committee's top Democrat, followed up on the doctrine of severability, central to the Affordable Care Act case being argued before the Supreme Court on Nov. 10, asking Barrett for her definition of it.

"The doctrine of severability as it's been described by the court, you know, serves a valuable function of trying not to undo your work when you wouldn't want a court to undo your work," Barrett said. "Severability strives to look at a statute as a whole and say: Would Congress have considered this provision so vital that -- kind of in the Jenga game, pulling it out -- Congress wouldn't want the statute anymore?"

"Insofar as it tries to effectuate what Congress would have wanted, it's the Congress and court working hand in hand," she said.

Feinstein said she was "impressed" at the response -- but when they moved along to voting rights, the senator was not satisfied with Barrett.

Feinstein raised Justice Scalia’s questioning during oral arguments in the 2013 case Shelby County V. Holder in which he questioned strong congressional support for re-enactment of the Voting Rights Act.

"Do you agree with Justice Scalia's assertion that the Voting Rights Act is a, quote, 'perpetuation of racial entitlement' end quote?" Feinstein asked.

Barrett said she can’t opine on the issue.

"Senator Feinstein, I can't -- I don't obviously know what Justice Scalia was thinking when he said that. And any characterization of the Voting Rights Act or a statement like that is simply really not something I can opine on. Because, you know, that's tied in, I would think, with the Shelby County questions,” Barrett said.

"I'm not asking for a formal opinion. But would you believe that it's a perpetuation of racial entitlement?" Feinstein pressed.

"Senator Feinstein, I think that goes to the question of whether the coverage formula was outdated and needed to be updated from the 1960s or not. I take that to be the thrust of the disagreement in Shelby County and the position that Justice Scalia was taking. So again, I can't express a view on Shelby County and whether the majority or dissent had the better of the argument," Barrett said.

Chairman Lindsey Graham began the hearing with a defense of Barrett’s impartiality as a judge, after Sen. Kamala Harris, D-Calif., suggested in her questioning Tuesday that Barrett’s personal views may inhibit her judicial independence.

Graham, taking specific issue with Harris' claim that Justice Ginsburg was more forthcoming in her hearing than Barrett has been, pointed to a single example in the Seventh Circuit when Barrett upheld a legislative provision that restricted access for protesters at abortion clinic, in an attempt to show Barrett has ruled against her personal beliefs.

"So, I'm highly confident that you will judge every American based on their case, not the law of Amy," Graham said. "There's one group in America I think has had a hard time of it, and that's conservatives of color and women conservatives ...This hearing, to me, is an opportunity to not punch through a glass ceiling but reinforce a concrete barrier around conservative women. You're going to shatter that barrier."

Graham went on to say he’s never been prouder of a nominee and thanked Trump for bringing her to the table.

"This is the first time in American history that we have nominated a woman who is unashamedly pro-life, and embraces her faith without apology, and she's going to the Court. A seat at the table is waiting on you. And it will be a great signal to all young women who want -- who share your view of the world that there's a seat at the table for them," Graham said.

Addressing complaints from Democrats that the fate of the Affordable Care Act is at stake in a case being argued before the court shortly after the election, Graham asked Barrett to outline the doctrine of severability -- namely, that part of a law can be overturned without the entire statute being struck down.

"The main thing is the doctrine of severability has a presumption to stave the statute is possible, is that correct?" Graham asked. "That is correct."

"I want every conservative in the nation to listen. The doctrine of severability presumes and its goal is to preserve the statute if that is possible. So, from a conservative point of view, generally speaking, we want legislative bodies to make laws, not judges, is that correct?

"That is correct," Barrett said.

"Would it be further true that if you can preserve a statute, you try to, to the extent possible?, Graham continued.

"That is true," Barrett said.

The third day of hearings for Supreme Court nominee Amy Coney Barrett kicked off in the Senate Judiciary Committee shortly after 9 a.m.

As with previous days, Barrett’s children and extended family filed into the hearing room ahead of her to watch.

In this second round of questioning, Democrats will likely follow up on whether Barrett would recuse herself from any election-related cases that could come before the Supreme Court later this year, while Republicans, squarely focused on getting the nomination through, counter their warnings.

Barrett, once again, has no notes or documents displayed on the witness table, opting to keep it simple with a blank notepad and pen.

After spending more than 11 hours on Capitol Hill Tuesday, Judge Barrett will face a second and possibly third round of questioning in the Senate Judiciary Committee Wednesday, and then members will enter a closed hearing to review her FBI background check.

In the second round of questioning, senators will be given 20 minutes each, as opposed to the 30 minutes they received Tuesday. The order of questioning is determined by seniority.

With 22 senators, the round is expected to last seven hours.

It's possible the committee will then enter a third round of questioning. If there is one, each senator will receive 10 additional minutes to question Barrett, adding roughly four hours to the hearing.

After questioning concludes, members will enter a closed session to review sensitive FBI background material on Barrett, as customary in the Supreme Court nomination process.

-ABC News' Trish Turner and Allie Pecorin