Democratic nominee Joe Biden and running mate Sen. Kamala Harris have faced growing pressure from Republicans to say whether they'd try to 'pack' the Supreme Court if Democrats were to win the White House and control of Congress in November, after both candidates have repeatedly dodged questions on the issue.

"You will know my opinion on court-packing when the election is over," Biden has said. "The moment I answer that question, the headline in every one of your papers will be about that rather than focussing on what's happening now. This election has begun. There's never been a court appointment once the election has begun."

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What does it mean to 'pack' the Supreme Court?

The idea of adding more justices to the Supreme Court or "packing" the court resurfaced after Justice Ruth Bader Ginsburg died in September.

The idea of adding more justices -- or what critics call "packing" the court to secure a desired majority -- is not unprecedented but has taken on new life with the death of Justice Ruth Bader Ginsburg and the Senate confirmation hearing for Judge Amy Coney Barrett.

Some Democrats -- including Senate Minority Leader Chuck Schumer -- and progressive groups have threatened to try to add justices to counter the effort by President Donald Trump and Senate Republicans to get Barrett confirmed before Election Day.

So, can a party in power really "pack" the court?

-ABC News' Devin Dwyer

The four days of Supreme Court confirmation hearings held by the Senate Judiciary Committee will look vastly different than previous hearings because of COVID-19 restrictions.

Sen. Mike Lee, R-Utah, and Sen. Thom Tillis, R-N.C., tested positive for the coronavirus after attending the White House Rose Garden ceremony to announce Barrett's nomination. As a result, members have the option of participating in the hearings remotely. Barrett is expected to appear in person, Lee is "undecided" and Tillis said Tuesday on Fox News that he anticipated attending some days of the hearing virtually.

On Friday, Sens. Kamala Harris, D-Calif., Patrick Leahy, D-Vt., and Cory Booker, D-N.J., sent a letter to Graham demanding "stringent" testing for all those in attendance. Sen. Joni Ernst, R-Iowa, tweeted that she also supported testing for members. But Graham has not responded.

Leahy, who is 80 years old, has decided to stay away from the hearings because of Graham's failure to respond. He and Harris have said they will participate remotely as a result.

Democrats are expected to mount additional challenges to safety of the hearing's proceedings, an official confirmed to ABC News.

Masks are now a mainstay of hearings on the Hill.

Long lines of spectators snaking through the halls of the Hart Senate Office Building waiting to get a glimpse of the proceedings will also be gone as the public will not be allowed inside. Only members, Barrett's guests, staff and journalists will be permitted.

Members who do appear will do so in bursts, an official confirmed to ABC News. They may appear to question Barrett but must return to their offices to watch the remainder of the hearing from a more isolated location.

-ABC News' Allison Pecorin

Amy Coney Barrett, if confirmed to the U.S. Supreme Court, would be the nation's 115th justice of SCOTUS and the first woman of school-aged children to serve on the nation's highest court.

No nominee has ever been confirmed by Congress this close to the election.

-ABC News' Trish Turner

Supreme Court nominee Judge Amy Coney Barrett will focus on her family, morals and judicial philosophy when she appears before the Senate Judiciary committee Monday, according to a copy of her opening statement released Sunday.

The 48-year-old judge on the Seventh Circuit Court of Appeals, Notre Dame law professor and mother of seven wrote in her statement that she was "used to being in a group of nine -- my family."

Barrett, who was nominated to fill the seat left vacant by the late Justice Ruth Bader Ginsburg, references the lessons she learned from the late Supreme Court Justice Antonin Scalia, particularly as it pertains to her interpretation of the law, in her statement.

"The policy decisions and value judgements of government must be made by the political branches elected by and accountable to the people," Barrett's statement reads. "The public should not expect courts to do so, and courts could not try."

-ABC News' Allison Pecorin