California’s Supreme Court is expected to issue a ruling today on whether undocumented students who are residents of California must be charged out-of-state tuition in the state’s public colleges and universities.

California is one of several states that charge in-state tuition rates to longtime residents even if they are undocumented. An estimated 25,000 students are currently enrolled under that policy, even as the state has been dramatically raising out-of-state tuition charges in an attempt to balance its books.

Undocumented students face high barriers to college enrollment, as they are ineligible for government financial aid. A lower court ruled that federal law prohibits the state from granting undocumented students in-state tuition rates, but the state government appealed that decision.

Update | The court unanimously upheld the in-state tuition law, known as AB-540. Further challenges in federal court are likely.