Challenges to Obamacare’s legal standing remain even after the Supreme Court issued another victory for the law’s supporters last week. Thirty-nine public school districts in Indiana have an ongoing lawsuit arguing that Obamacare violates their 10th Amendment right to state sovereignty, according to the Indianapolis Star.

The lawsuit focuses on Obamacare’s employer mandate, under which firms with 50 or more full-time employees must provide health insurance or pay a fine. The mandate also applies to government employers.