Comptroller of the Currency Eugene A. Ludwig is under fire in Congress, but his power to expand the national bank charter has been unanimously, and repeatedly, supported by the Supreme Court.

Lawyers and industry officials said the comptroller's string of legal victories - capped by Monday's high court decision on credit card fees - should help bankers fight off legislative attempts to limit the agency's authority. In addition, this success in the courts may embolden the Office of the Comptroller of the Currency to bestow even greater powers on national banks.

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