The U.S. Supreme Court has ruled against the use of nationwide injunctions, effectively ending the practice of lower courts issuing broad, universal injunctions that apply across the country. This decision emerged from the case Trump v. CASA and marks a significant shift in the judicial landscape, particularly in how federal judges can check executive and agency actions. While other mechanisms remain for courts to oversee executive power, they are considered potentially less effective than nationwide injunctions. The ruling introduces uncertainty regarding the enforcement of executive and agency actions and raises questions for employers and litigants nationwide. The decision was part of a series of major rulings concluded at the end of the Court's term, impacting immigration, federal litigation, and the balance of judicial authority.