In the latest constitutional challenge against the Consumer Financial Protection Bureau, the agency was accused Monday of overstepping its authority by attempting to regulate the practice of law and collect personal financial data.

A complaint filed in the U.S. District Court for the District of Columbia accused the agency of trying to force a company that provides support services to lawyers to turn over confidential personal financial information. The plaintiffs also claimed the bureau was weighing enforcement actions over fee arrangements in bankruptcy matters that would "usurp" the authority of state bar associations.