The U.S. Supreme Court became another player in the contentious, election-year immigration debate as it agreed Tuesday to decide whether the Obama administration has the authority to delay the deportation of nearly 5 million undocumented immigrants.

The justices said they would hear the administration’s appeal of what it calls a lower court’s “unprecedented nationwide injunction” against a program known as Deferred Action for Parents of Americans and Lawful Permanent Residents, or DAPA.