A professor at Notre Dame Law School, she was nominated by Trump in 2017 to serve on the 7th U.S. Circuit Court of Appeals, which hears cases from Illinois, Indiana and Wisconsin.
Trump's choice of her could strengthen his backing from conservatives, especially those who view the court as a central issue and have stuck with Trump despite reservations about his character and behavior.
Before the 2016 election, Trump released a list of potential court nominees that had been vetted by conservative groups, helping the political outsider lock down support from conservatives. Barrett was not on the original list but was added in 2017.
In addition to overturning Roe, many religious conservatives would also like to pull back on the expansion of rights for gay couples and allow a greater role for religion in public life.
Business conservatives are hoping the court will push back on environmental regulations, protections for labor unions, and other legal interpretations that have favored consumers.
But a potential swing to the right could also galvanize political opposition from liberals, who worry not only that the court would overturn the abortion precedent, but could also help Trump follow through on his threats to use the courts to litigate the November election if he loses.
The court has also issued two decisions upholding Obamacare that could be in jeopardy. The justices will hear a third challenge to the law the week after the election.
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