In a case involving birthright citizenship, Trump v. CASA, the Court limited the power of judges to issue universal injunctions that protect everyone subject to an illegal government policy. President Trump hailed this outcome as a great victory, and it does provide more maneuvering room for him and future presidents. But the Court’s reasoning does not implicate most judicial rulings about the legality of regulations. The Court also left open some important questions that will be furiously litigated in the lower courts or the Supreme Court itself.