GOP lawmaker jokes about Trump's next Interior chief: It's going to be Mulvaney

A GOP lawmaker joked Saturday that President TrumpDonald John TrumpBusiness school deans call for lifting country-specific visa caps Bolton told ex-Trump aide to call White House lawyers about Ukraine pressure campaign: report Federal prosecutors in New York examining Giuliani business dealings with Ukraine: report MORE already has someone in place who could succeed outgoing Interior Secretary Ryan ZinkeRyan Keith ZinkeOvernight Energy: Advisory panel pushes park service to privatize campgrounds | Dems urge Perry to keep lightbulb efficiency rules | Marshall Islands declares national climate crisis Committee pushes National Park Service to privatize campgrounds Overnight Energy: Warren unveils T environmental justice plan | Trump officials eliminate board on smart grids | Proposed Trump rule aims to ease restrictions on mineral mining MORE: White House budget chief Mick MulvaneyJohn (Mick) Michael MulvaneyHillicon Valley: Trump official declines to testify on trade protections for tech | Senators call for better info-sharing on supply chain threats | Apple pulls app after Chinese pressure Overnight Energy: Dems subpoena Perry in impeachment inquiry | EPA to overhaul rules on lead contamination tests | Commerce staff wrote statement rebuking weather service for contradicting Trump Commerce staff drafted statement rebuking weather service for contradicting Trump's hurricane predictions MORE.

Mulvaney, a former conservative congressman from South Carolina, has held several roles in the Trump administration over the past two years — some at the same time. 

After Trump announced Saturday that Zinke would leave the administration at the end of the year, Rep. Justin AmashJustin AmashAmash says he's happy not feeling 'bound to a particular party' Amash on Syria: Trump's not ending anything Trump says House Democrats 'unfortunately' have the votes to impeach MORE (R-Mich.) joked on Twitter that Mulvaney would be Trump's pick to become the new Interior secretary.

Trump first tapped Mulvaney to serve as director of the Office of Management and Budget (OMB), a position he has held since February 2017.

Mulvaney then retained a dual role in the administration by also becoming the acting head of the Consumer Financial Protection Bureau (CFPB) in November 2017.

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On Friday, Trump named Mulvaney as his acting chief of staff, replacing John KellyJohn Francis KellyMORE, who is leaving at the end of the month. But the White House said Friday night that Mulvaney would also keep his title as director of the White House budget office.

His deputy at OMB, Russ Vought, will lead day-to-day operations at the agency while Mulvaney focuses on his chief of staff responsibilities, the White House said Friday.

Mulvaney's responsibilities leading the CFPB have ended, however, with the new permanent head of the agency sworn in this week.

“Mick Mulvaney will not resign from the Office Of Management and Budget, but will spend all of his time devoted to his role as the acting Chief Of Staff for the President. Russ Vought will handle day to day operations and run OMB,” White House press secretary Sarah Huckabee Sanders said.

It's unclear how long Mulvaney will serve as acting chief of staff, or whether he will eventually be moved to a permanent position.

“There’s no time limit. He’s the acting chief of staff, which means he’s the chief of staff. He got picked because the president liked him, they get along,” a senior administration official told reporters on Friday.

Trump announced Saturday that Zinke would exit the administration at the end of the month, though it was unclear whether he had been fired or had offered his resignation.