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In its second and final decision of the day, the Supreme Court on Thursday said Biden can terminate a controversial Trump-era immigration policy, known as Remain in Mexico. The ruling affirms a president’s broad power to set the nation’s immigration policy.

The ruling concludes the most consequential supreme court term in recent memory.

The case, which was backed by a host of other Republican-led states including Texas and Kentucky, was highly unusual in that it was based upon the Clean Power Plan, an Obama-era strategy to cut emissions from coal-fired power plants that never came into effect. The Biden administration sought to have the case dismissed as baseless given the plan was dropped and has not been resurrected.

Not only was this case about a regulation that does not exist, that never took effect, and which would have imposed obligations on the energy sector that it would have met regardless. It also involves two legal doctrines that are not mentioned in the constitution, and that most scholars agree have no basis in any federal statute.