For the better part of the second Trump presidency, Rebecca Kelly Slaughter has been in court, fighting to get her job back. Last March, Donald Trump fired her without cause from her Senate-appointed role as a member of the Federal Trade Commission, violating federal law and the nearly century-old precedent that gave rise to modern independent agencies—which empowers Congress to insulate their leaders and expertise from political pressure and corruption. Lower courts agreed with her view of the law, briefly reinstating her a couple of times, but the Supreme Court had other ideas. And last month, in Trump v. Slaughter, its conservative supermajority ruled against Slaughter by overruling that precedent, and, in the process, declared that lawmakers’ decisions to shield officeholders like her from the whims of the president was unconstitutional. Writing for the court’s Republican-aligned justices, Chief Justice John Roberts reasoned that “Slaughter served as the President’s subordinate at the FTC,” and thus he “was entitled to cut her tenure short.” The landmark decision, which will shape the future of American governance in everything …