Antonin Scalia,
New Orleans Public Service Inc v…
“ We disagree. There is no greater federal interest in enforcing the supremacy of federal statutes than in enforcing the supremacy of explicit constitutional guarantees, and constitutional challenges to state action, no less than pre-emption-based challenges, call into question the legitimacy of the State's interest in its proceedings reviewing or enforcing that action. Yet it is clear that the mere assertion of a substantial constitutional challenge to state action will not alone compel the exercise of federal jurisdiction. ”
