WASHINGTON, D.C. — Newly confirmed conservative U.S. Supreme Court Justice Amy Coney Barrett faces a barrage of politically fraught cases in her first days on the job, as the court weighs election disputes and prepares to hear a challenge to the Obamacare healthcare law.

On Monday, the Republican-controlled Senate pushed through her confirmation over Democratic objections to an appointment so close to the Nov. 3 presidential election. President Trump, who nominated Barrett, has said he expects the court to decide the outcome of the election in which he is being challenged by Democrat Joe Biden.

Barrett, 48, was formally sworn in by Chief Justice John Roberts for the lifetime job in a private ceremony at the court on Tuesday morning. Barrett joins the court with two election issues already awaiting her from hotly contested battleground states North Carolina and Pennsylvania.

The court would be expected to act on both before Election Day with Barrett, previously an appeals court judge and legal scholar, as part of its expanded 6-3 conservative majority. No Supreme Court justice had ever been confirmed so close to a presidential election.

“I cannot think of any other situation like this,” said Rick Hasen, an expert on election law at the University of California, Irvine School of Law. “It really is a potential baptism by fire.”

One week after the election, on Nov. 10, the court is due to hear a case in which Republicans, including Trump, are asking the court to strike down the 2010 Affordable Care Act, commonly known as Obamacare.

During Barrett’s Senate confirmation hearing two weeks ago, Democrats focused on both Obamacare and election cases in voicing opposition to her confirmation. They urged her to step aside from both cases. Barrett refused to make such a commitment. Justices have the final say on whether they recuse themselves in a case.

At a White House ceremony on Monday night, in which conservative Supreme Court Justice Clarence Thomas administered to her one of the two oaths of office that justices must take, Barrett pledged her independence from politics.

“This separation of duty from political preference is what makes the judiciary distinct,” Barrett said.

The political pressures put Barrett in a difficult position and she may tread carefully, said Jessica Levinson, a professor at Loyola Law School in Los Angeles.

“She could be on the court for four decades,” Levinson added. “I don’t think she wants her first big ruling to be raising a question about her independence.”

Voting disputes and Obamacare

Trump has said he wanted Barrett to be confirmed before Election Day, so she could cast a decisive vote in any election-related dispute, potentially in his favor.

The Supreme Court has only once decided the outcome of a U.S. presidential election — the disputed 2000 contest ultimately awarded to Republican George W. Bush over Democrat Al Gore.

The justices already have tackled multiple election-related emergency requests this year, some related to rules changes prompted by the coronavirus pandemic.

On Monday night, the conservative justices were in the majority as the court declined by a 5-3 vote to extend mail-in voting deadlines sought by Democrats in Wisconsin.

Last week, in a sign of how Barrett’s appointment could affect such cases, the court split 4-4 in a case from Pennsylvania, handing a loss to Republicans hoping to curb the counting of mail-in ballots received after Election Day.

On Friday, Republicans asked the court to block the mail-in ballot counting in Pennsylvania, knowing that Barrett was about to be confirmed.

Even before Barrett’s appointment, the court’s conservative majority has generally sided with state officials who oppose court-imposed changes to election procedures to make it easier to vote during the pandemic.

Obamacare challenge

The Obamacare case is the third major Republican-backed challenge to the law, which has helped roughly 20 million Americans obtain medical insurance. It also bars insurers from refusing to cover people with pre-existing medical conditions.

Republican opponents have called the law an unwarranted intervention by government in health insurance markets.

The Supreme Court upheld Obamacare 5-4 in 2012 and rebuffed another challenge by 6-3 in 2015.

Barrett has criticized those two rulings. Democrats opposing her nomination emphasized that she might vote to strike down Obamacare, although legal experts think the court is unlikely to do so.

The court will hear another major case on Nov. 4 concerning the scope of religious rights exemptions to certain federal laws. The dispute arose from Philadelphia’s decision to bar a local Roman Catholic entity from participating in the city’s foster care program because the organization prohibits same-sex couples from serving as foster parents.

The court began its current term on Oct. 5, shorthanded following the death of Barrett’s predecessor, liberal Justice Ruth Bader Ginsburg. If the court was divided 4-4 in any of the cases argued before Barrett was appointed, it could hold a second round of oral arguments so Barrett can participate.