The dueling heads of the Consumer Finance Protection Bureau both showed up for work Monday and both claimed they were in charge of the watchdog agency.

White House budget chief Mick Mulvaney, whom President Trump named as interim director last Friday, showed up at the CFPB offices in Washington, DC, carrying a Dunkin’ Donuts bag, CNBC reported.

A tweet from John Czwartacki, Mulvaney’s aide at the Office of Management and Budget, showed him sitting at a desk amid briefing books from the CFPB. ​”​@MickMulvaneyOMB sitting in director’s office. Already hard at work as acting director at cfpb,” the post said.

Leandra English, whom outgoing director Richard Cordray picked to fill his seat after he resigned Friday, also showed up at the agency, but CNN reported it was unclear whether she and Mulvaney had any interaction.

English, the CFPB’s deputy director, filed a lawsuit in Washington, DC, federal court Friday in an effort to stop Mulvaney from occupying the top spot.

Mulvaney showed up Monday with donuts, but also a memo for the staff and a directive from the White House that he be given full access to the director’s office and “full cooperation” from the staff.

“Please disregard any instructions you receive from Ms. English in her presumed capacity as Acting Director,” Mulvaney wrote to staff, Reuters reported. “If you receive additional communications from her today … please inform the General Counsel.”

English also sent an email to CFPB staff, saying “it is an honor to work with all of you” and thanking them for “your service.”

Both messages were signed by the “acting director.”

English’s lawyers argued in the suit that she is entitled to the post under the Dodd-Frank Wall Street Reform Act that states the deputy director takes over if the seat becomes vacant.

On Saturday, the Department of Justice said in a memo that Trump has the authority to name a new director.

The White House on Sunday night said CFPB general counsel Mary McLeod agreed that Trump has the right to name a director.

“There should be no question that Director Mulvaney is the Acting Director. It is unfortunate that Mr. Cordray decided to put his political ambition above the interests of consumers with this stunt,” White House press secretary Sarah Huckabee Sanders said in a statement.

CFPB division heads were telling staff that they should follow McLeod’s ruling that Mulvaney was the acting director, Bloomberg reported.

Besides the legal battle, the appointment has set off a political war, with Democrats arguing that Trump is just trying to weaken the financial watchdog.

“Wall Street hates it like the devil hates holy water. And they’re trying to put an end to it with Mr. Mulvaney stepping into Cordray’s spot,” Sen. Dick Durbin (D-Ill.) said Sunday on CNN’s “State of the Union.”

But Sen. Lindsay Graham (R-SC) said the CFPB doesn’t help consumers and hinders the ability of banks to do their work.

“Really no oversight at all,” ​Graham said on CNN. “They can get into everybody’s business. I don’t think they added much at all to the consumer protection. They sure add a lot to increasing costs for midsize banks throughout the country that had nothing to do with the financial collapse.”