A four-year-old fight between the Catholic Church and the Obama administration reaches the Supreme Court on Wednesday, in a bishop’s challenge to the health-care law’s contraception requirements that could alter the boundaries of religious freedom.

Eight justices will weigh how far the government has to go to accommodate religiously affiliated employers that object to including contraception in workers’ insurance plans. The outcome could affect as many as a million Catholic nonprofit employees. The case comes after the court’s 2014 Hobby Lobby ruling that for-profit businesses could assert such objections.

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