The Trump administration returned to the Supreme Court on Monday to ask the justices to reverse a lower court order that has blocked mass firings and major reorganizations at federal agencies, a case that could have enormous implications for the president’s power to reshape the federal government.

A lower court judge blocks a part of President Trump’s agenda, an appellate panel refuses to put the order on hold while the case continues, and the Justice Department turns to the Supreme Court.

The case from Maryland was the court’s latest opportunity to apply its recently announced history-based test for assessing the constitutionality of gun control laws.