WASHINGTON — Twenty current and former Democratic members of Congress sided with the Financial Stability Oversight Council in a legal brief filed Thursday, arguing that its designation of MetLife as a systemically important financial institution should not have been struck down in federal court.

The ruling is "inconsistent with Dodd-Frank's text and fundamentally misunderstands its structure and operational design," said the brief, whose signatories included Christopher Dodd and Barney Frank, the two former lawmakers who sponsored the 2010 law that created the FSOC.

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