Trump v. California

Majority reasoning

The per curiam opinion held that the states lacked standing because each challenged provision was merely an internal directive to executive branch officials that imposed no legal obligations on the states themselves. It reasoned that any injury to the states depended on a long chain of speculative future events—whether agencies would find implementation feasible and lawful, what specific actions they would take, and whether those actions would ultimately harm the states—which is too speculative to support a lawsuit under Article III's case-or-controversy requirement. The Court rejected the states' argument that citizenship lists and prosecution priorities were linked, finding no textual basis connecting the two sections. It also found the government would suffer irreparable harm from an injunction that broadly barred agencies from even attempting lawful action, and that the equities favored a stay because the Order imposes no concrete demand on the states. Responding to the dissent's argument that a toothless injunction cannot cause real harm, the majority noted in a footnote that the injunction was actually broader than described, declaring the entire order unlawful as to the states and blocking any implicit implementation, which does inflict a genuine intrusion on executive operations.

Dissent reasoning

Justice Sotomayor, joined by Justice Kagan, argued that reading the Order's sections together, along with the government's own admissions, shows a credible threat that federal officials would use citizenship lists to trigger prosecutions against state officials who don't comply, which is enough for standing under prior precedent allowing pre-enforcement challenges to credible threats. She also argued the government could not simultaneously claim the Order's effects were too speculative for standing purposes while claiming urgent need to implement it now for irreparable-harm purposes. Justice Jackson dissented separately, arguing the government showed no irreparable harm because it never defended the Order's underlying legality, and an injunction against unlawful conduct cannot injure the government. She contended the lower courts made detailed factual findings—not speculation—showing states already face real costs and prosecution threats, that the majority's reasoning conflicts with the recent Bost decision on election-rule standing, and that letting the government proceed risks last-minute election chaos that harms voters and undermines confidence in courts, especially given the government's inconsistent timing arguments suggesting a strategy to delay judicial review while pushing implementation forward.