A front-runner to fill the Supreme Court seat vacated by the death of Justice Ruth Bader Ginsburg is a federal appellate judge who has established herself as a reliable conservative on hot-button legal issues from abortion to gun control.

Amy Coney Barrett, a devout Catholic, is hailed by religious conservatives and others on the right as an ideological heir to conservative icon Antonin Scalia, the late Supreme Court justice for whom she clerked.

Liberals say Barrett’s legal views are too heavily influenced by her religious beliefs and fear her ascent to the nation’s highest court could lead to a scaling back of hard-fought abortion rights. She also would replace the justice who is best-known for fighting for women’s rights and equality.

President Donald Trump  has said he’ll nominate a woman and Barrett is thought to be at the top of his list of favorites. The Chicago-based 7th U.S. Circuit Court of Appeals judge was considered a finalist in 2018 for Trump’s second nomination to the high court, which eventually went to Brett Kavanaugh after Justice Anthony Kennedy retired. Barrett’s selection now could help Trump energize his base weeks before Election Day.

At just 48, Barrett would be the youngest justice and her tenure could last for decades. She’s made her mark in law primarily as an academic at the University of Notre Dame, where she began teaching at age 30. She first donned judges’ robes in 2017 after Trump nominated her to the 7th Circuit.

But she wouldn’t be the only justice with little prior experience as a judge: John Roberts and Clarence Thomas spent less time as appellate judges before their Supreme Court nominations and Elena Kagan had never been a judge before President Barack Obama nominated her in 2009.

Barrett mentioned Kagan when asked in a White House questionnaire in 2017 about which justices she admired most, saying Kagan brought to the bench “the knowledge and skill she acquired as an academic to the practical resolution of disputes.”

When Barrett’s name first arose in 2018 as a possible Trump pick, even some conservatives worried her sparse judicial record made it too hard to predict how she might rule. Nearly three years on, her judicial record now includes the authorship of around 100 opinions and several telling dissents in which Barrett displayed her clear and consistent conservative bent.

She has long expressed sympathy with a mode of interpreting the Constitution, called originalism, in which justices try to decipher original meanings of texts in assessing if someone’s rights have been violated. Many liberals oppose that strict approach, saying it is too rigid and doesn’t allow the Constitution to change with the times.