The highly anticipated case challenging ObamaCare's subsidies will officially reach the Supreme Court on March 4.

Justices will hear arguments in King v. Burwell in just under three months, according to the court’s schedule posted Monday afternoon.

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The case, led by conservative groups, questions whether the federal government can legally hand out healthcare subsidies in 34 states that have opted out of creating their own exchanges.

The plaintiffs of the case also released their opening brief on Monday, a 129-page document that lays out their case against the subsidies.

The court announced in November that it would take up the case, surprising many court-watchers and healthcare experts. Democrats, including the authors of ObamaCare, have come to the law’s defense.

King v. Burwell, like the Halbig v. Burwell case, has a long history in the nation’s court system. On July 22, two U.S. courts delivered opposite rulings on the subsidies.

Legal scholars and health policy experts have warned that the case is the biggest legal threat against ObamaCare since 2012, when the Supreme Court upheld most provisions of the law. It is the last case scheduled for the court's next period.