It was unclear whether Ginsburg would be back on bench when the court next meets on January 7.
Branding him "gross and ghoulish", she urged O'Reilly to join her in prayer for Ginsburg's recovery, rather than trying to politicize the possible implications of her compromised health. The growths were discovered after she fell in November, according to a press release from the U.S. Supreme Court.
"Currently, no further treatment is planned", the court said in a statement.
Flores, who was not involved in Ginsburg's treatment, said her quality of life should not diminish because of a missing lobe.
A little over a month after fracturing three ribs in a nasty fall, Ginsburg underwent surgery for lung cancer on Friday.
Ginsburg is expected to remain in the hospital for a few days, the court said. The procedure can be either minimally invasive or be done with a longer incision on the side of the chest.
The surgery was performed by Dr. Valerie Rusch, one of the first female thoracic surgeons. She is both decorous and determined and makes it a point not to "waste energy" on emotional reactions.
He observed that she might have waited to have the operation at a time when she had several weeks to recover. That is something she has done for years, powering through even the death of her beloved husband of 56 years in 2010.
Ginsburg is the oldest member of the court, and the most senior of the court's four liberals.
After Justice Anthony Kennedy, a centrist conservative, announced his retirement earlier this year, Trump picked conservative Brett Kavanaugh to replace Kennedy.
On social media on Friday and Saturday, Ginsburg's fans called for a "prayer circle", cheered as she voted from her hospital bed to strike down Trump's attempt to stop migrants seeking asylum, and cited her most famous decisions. The Republican president has already had two supreme court picks, swaying the court's balance toward conservatives. She posed for the court's class photo on November 30, attended funeral services for President George H.W. Bush at the Washington National Cathedral on December 5, and was active during Supreme Court arguments the next day on a case involving double jeopardy.