WASHINGTON — Though reading tea leaves at the Supreme Court is notoriously tricky, several justices during oral arguments Tuesday on a key preemption case appeared to support the Office of Comptroller of the Currency's ability to enforce laws exclusively at national banks.

Just two years after ruling 5 to 3 in the agency's favor in another preemption case, the court tried to determine whether state officials have the power to enforce their own laws against national banks if those laws have not been preempted.

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