WASHINGTON — The U.S. branches of certain foreign banking firms are "informally" being included in a regulatory initiative to beef up supervisory standards for large federally-chartered institutions, a senior official said Monday.

An Office of the Comptroller of the Currency proposal released earlier this year would formalize and refine a set of "heightened expectations" the agency has imposed on large OCC-supervised institutions since 2010. The proposal, for which the agency is now accepting comments, applies to national banks with over $50 billion in assets.

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