The court battle over the Consumer Financial Protection Bureau’s top leadership has shifted in the Trump administration’s favor, but continued litigation could test its ability to revamp the agency.

Judge Timothy J. Kelly yesterday denied deputy director Laura English’s bid for an order that would have barred Office of Management and Budget Director Mick Mulvaney from serving as acting CFPB director, setting up what many expect to be an appeal to the U.S. Court of Appeals for the District of Columbia Circuit.

Although plenty of questions lie ahead, perhaps the biggest is whether and to what extent ongoing uncertainty raised by the case impacts the administration’s effort to revamp consumer protection regulation at the CFPB.

“This is clearly a win for the administration, but there’s still so much uncertainty,” David Reiss, professor of law at Brooklyn Law School in Brooklyn, N.Y, told Bloomberg Law in a phone interview. “What we’ll see for the next few months is whether that uncertainty makes it harder for Mulvaney to turn the ship.”

Kelly’s 46-page decision, which several attorneys privately described as careful and thorough, is the second such setback for English, who previously lost a bid for a temporary restraining order. Even so, hazards lie ahead for the administration.

University of Michigan Law School Professor Nina Mendelson said an eventual ruling on the merits against Mulvaney could call into question any actions based on authority he now claims, such as final regulations, settlements, or other matters.

“A court could invalidate all of those actions,” Mendelson said on a call hosted by consumer advocates. Mendelson, an expert on administrative law, said she’s taken an independent stance on the case.

New York Challenge

Kelly’s Jan. 10 ruling isn’t the last word, according to Brianne Gorod, an attorney with the Constitutional Accountability Center who also joined the call. “The legal fight here is far from over,” she said.

The decision also may boost the stakes for a separate challenge to Mulvaney in federal court in New York. There, the Lower East Side People’s Federal Credit Union also seeks a court order declaring that English, not Mulvaney, is the CFPB’s rightful acting director. The credit union says the appointment of Mulvaney has thrown the credit union into “regulatory chaos,” because it can’t identify the lawful director of the CFPB.

Judge Paul G. Gardephe is scheduled to hear argument tomorrow on Mulvaney’s motion to dismiss that lawsuit. Although the cases are similar, Gardephe isn’t bound by Kelly’s Jan. 10 decision.

The case is English v. Trump, D.D.C., 17-cv-02534, 1/10/18.