The justices will decide whether to impose new restrictions on the abortion pill mifepristone, and whether a federal law requiring emergency room treatment conflicts with a state abortion ban.

In the most closely watched case, the court is weighing whether to impose new restrictions on the commonly used abortion pill mifepristone, including putting new curbs on access by mail.

In the other case, which has received less attention but could have far-reaching implications of its own, the justices are considering whether a near-total abortion ban in Idaho conflicts with a federal law requiring emergency medical care for patients, including pregnant women.