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

A GOP lawmaker joked Saturday that President TrumpDonald John TrumpNASA exec leading moon mission quits weeks after appointment The Hill's Morning Report — After contentious week, Trump heads for Japan Frustration boils over with Senate's 'legislative graveyard' MORE already has someone in place who could succeed outgoing Interior Secretary Ryan ZinkeRyan Keith ZinkeSenate panel approves Interior nominee over objections from Democrats Interior's border surge puts more officers in unfamiliar role Not 'if' but 'when' is the next Deepwater Horizon spill? MORE: White House budget chief Mick MulvaneyJohn (Mick) Michael MulvaneyOn The Money: Judge rules banks can give Trump records to House | Mnuchin pegs debt ceiling deadline as 'late summer' | Democrats see momentum in Trump tax return fight | House rebukes Trump changes to consumer agency House rebukes Mulvaney's efforts to rein in consumer bureau The Hill's Morning Report - Pelosi remains firm despite new impeachment push 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 AmashEx-GOP lawmaker pens op-ed calling for Trump to be impeached On The Money: Senate passes disaster aid bill after deal with Trump | Trump to offer B aid package for farmers | House votes to boost retirement savings | Study says new tariffs to double costs for consumers Amash: Some of Trump's actions 'were inherently corrupt' 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.