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

A GOP lawmaker joked Saturday that President TrumpDonald John TrumpDavid Axelrod after Ginsburg cancer treatment: Supreme Court vacancy could 'tear this country apart' EU says it will 'respond in kind' if US slaps tariffs on France Ginsburg again leaves Supreme Court with an uncertain future MORE already has someone in place who could succeed outgoing Interior Secretary Ryan ZinkeRyan Keith ZinkeBLM issues final plan for reduced Utah monument New policy at Interior's in-house watchdog clamps down on interactions with press Overnight Energy: EPA proposes scrapping limits on coal plant waste | Appointee overseeing federal lands once advocated selling them | EPA lifts Obama-era block on controversial mine MORE: White House budget chief Mick MulvaneyJohn (Mick) Michael MulvaneyTrump's latest plan to undermine Social Security Trump says he'll decide on foreign aid cuts within a week Dick Cheney to attend fundraiser supporting Trump reelection: report 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 AmashLawmakers blast Trump as Israel bars door to Tlaib and Omar House Democrats targeting six more Trump districts for 2020 Sanford headed to New Hampshire amid talk of challenge to Trump 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.