In a rebuke of the Bush administration, the Supreme Court ruled Monday that a federal bank regulator erred in quashing efforts by New York state to combat the kind of predatory mortgage lending that triggered the nation’s financial crisis.

The 5-4 ruling by the high court was unusual. Justice Antonin Scalia, arguably the most conservative jurist, wrote the majority’s opinion and was joined by the court’s four liberal judges. Read more about bank regulation…