A collection of 21 current and former federal lawmakers who might be considered the staunchest supporters of the Consumer Financial Protection Bureau filed an amicus brief on Tuesday asking the U.S. Court of Appeals for the District of Columbia Circuit to review its decision that in part called the “unconstitutionally structured.”

The group that included Sen. Elizabeth Warren, Rep. Nancy Pelosi —the U.S. House Minority Leader — as well as former Rep. Barney Frank declared in the brief that, “By concluding that the CFPB’s leadership structure is unconstitutional and severing the provision that made its director removable only for cause, the panel decision fundamentally altered the CFPB and hampered its ability to function as Congress intended. It also called into question the constitutionality of other regulatory agencies with similar structural features.

“For those reasons alone, this case involves a question of ‘exceptional importance’ that merits reconsideration by the en banc court,” the brief continued that’s available here and also signed by Sen. Sherrod Brown, who is ranking member of the Senate Banking Committee, along with Sen. Harry Reid, the outgoing Senate Minority Leader.

To recap, the matter began back in October when the U.S. Court of Appeals for the District of Columbia Circuit ruled in favor of a finance company that operates in the mortgage space, rescinding a $109 million enforcement action the bureau handed out nearly two years ago.

In writing for the 2-1 majority, U.S. Circuit Judge Brett Kavanaugh said, “In this case, the single-director structure of the CFPB represents a gross departure from settled historical practice. Never before has an independent agency exercising substantial executive authority been headed by just one person.

“The CFPB’s concentration of enormous executive power in a single, unaccountable, unchecked director not only departs from settled historical practice, but also poses a far greater risk of arbitrary decision-making and abuse of power, and a far greater threat to individual liberty, than does a multi-member independent agency,” Kavanaugh continued in the 110-page court document available here.

Speaking for the brief filers, Pelosi elaborated why the group made this move.

“Congress carefully designed the CFPB to elevate the interests of consumers above those of a well-heeled industry and provided for a single director removable for cause to ensure accountability and effectiveness,” Pelosi said.

“As the brief states, the DC Circuit should rehear this case en banc because last month’s decision by the DC Circuit panel was inconsistent with the Constitution and Supreme Court precedent,” she continued. “Under the Constitution, Congress has considerable latitude to shape the structure of independent agencies.

“We cannot allow financial interests to again offer abusive and predatory loans to consumers and precipitate another financial crisis,” Pelosi went on to say.