President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Friday named budget director Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE as his acting White House chief of staff, capping off a week of frenzied speculation about who would take over the key West Wing role.

Trump said in a pair of Twitter posts that Mulvaney would start at the beginning of next year after outgoing chief of staff John Kelly John Francis KellyMORE leaves his post.

“Mick has done an outstanding job while in the Administration,” Trump wrote. “I look forward to working with him in this new capacity as we continue to MAKE AMERICA GREAT AGAIN!”

The president praised Kelly’s service and called the retired Marine Corps general “a GREAT PATRIOT.”

I am pleased to announce that Mick Mulvaney, Director of the Office of Management & Budget, will be named Acting White House Chief of Staff, replacing General John Kelly, who has served our Country with distinction. Mick has done an outstanding job while in the Administration.... — Donald J. Trump (@realDonaldTrump) December 14, 2018

....I look forward to working with him in this new capacity as we continue to MAKE AMERICA GREAT AGAIN! John will be staying until the end of the year. He is a GREAT PATRIOT and I want to personally thank him for his service! — Donald J. Trump (@realDonaldTrump) December 14, 2018

Mulvaney in a tweet called the appointment a “tremendous honor” and said “it’s going to be a great 2019!”

As his title indicates, Mulvaney, 51, will temporarily serve as chief of staff until Trump can find a permanent replacement. The president did not indicate how long the selection process will take.

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“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.

Asked why Mulvaney was named acting chief of staff instead of simply chief of staff, the official responded “because that’s what the president wants.”

White House press secretary Sarah Huckabee Sanders said Friday night that Mulvaney would keep his title as Office of Management and Budget (OMB) director while also serving as acting chief of staff.

Russell Vought, Mulvaney’s deputy at OMB, will take over for Mulvaney in the budget office while he focuses on his chief of staff responsibilities, Sanders said.

“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," Sanders said in a statement.

It is the second time the OMB director has taken on a high-profile administration role in an acting capacity. He had led the Consumer Financial Protection Bureau (CFPB) since November 2017 after its previous director, Obama holdover Richard Cordray Richard Adams CordrayConsumer bureau revokes payday lending restrictions Supreme Court ruling could unleash new legal challenges to consumer bureau Supreme Court rules consumer bureau director can be fired at will MORE, left the post. The new permanent director was sworn in this week.

Trump spent this week scrambling to choose a successor to Kelly after his first choice, Vice President Pence’s chief of staff Nick Ayers, turned down the job over a disagreement over how long he would serve.

Ayers’s decision came one day after Trump abruptly announced last Saturday that Kelly would be leaving his job after a tumultuous 17-month tenure.

Trump appeared sensitive to rejections from Ayers and other candidates and bristled at the emerging narrative that he was struggling to attract top talent for the job.

“For the record, there were MANY people who wanted to be the White House Chief of Staff. Mick M will do a GREAT job!” he tweeted Friday evening.

Mulvaney’s name surfaced earlier this week as one person who could be considered for the job, but people close to the budget director indicated he was more interested in a Cabinet post.

Trump met with Mulvaney earlier Friday at the White House to discuss the Dec. 21 government funding deadline, according to the official, but emerged with the chief of staff job. Officials cited Mulvaney's experience as a former member of Congress as a key selling point for the president.

“He knows Congress. He knows Capitol Hill,” the official said of Mulvaney, who served three terms in the House as a firebrand Republican from South Carolina.

The official noted that Mulvaney “didn't find out about [the announcement] on Twitter.”

Mulvaney was a key figure in the Tea Party movement when he was elected in 2010 and was a founding member of the House Freedom Caucus. He became known as one of the most fiscally conservative members of Trump’s team, drafting budget requests that called for dramatic cuts to federal government.

The new acting chief faces a tall task of steering the White House through a political minefield marked by intensifying federal investigations into Trump’s associates and the 2016 campaign as well as an emboldened Democratic majority in the House.

House Minority Leader Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE’s (D-Calif.) office called Mulvaney’s appointment a sign that Trump is not interested in resolving the government-funding impasse, driven by the president’s demands for border wall funds.

“It sends a clear message that at this critical time the president would choose to elevate the architect of the last Republican government shutdown,” said Pelosi adviser Drew Hammill.

Kelly, and his predecessor Reince Priebus Reinhold (Reince) Richard PriebusLeaked audio shows Trump touted low Black voter turnout in 2016: report Meadows joins White House facing reelection challenges Trump names Mark Meadows as new chief of staff MORE, also struggled to manage the president and navigate the warring factions inside the West Wing.

The president’s selection of Mulvaney came after several other candidates, including Rep. Mark Meadows (R-N.C.) and former New Jersey Gov. Chris Christie (R), announced publicly they would not take the job.

Christie said Friday he was not interested after meeting privately with Trump the previous day. The White House said Meadows was out after the two discussed it earlier in the week.

Former Trump campaign aide David Bossie also met with the president on Friday about the job.

Other people said to have been considered by the White House included Treasury Secretary Steven Mnuchin Steven Terner MnuchinHillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars Treasury: Trump's payroll tax deferral won't hurt Social Security Treasury sanctions individuals, groups tied to Russian malign influence activities MORE, U.S. Trade Representative Robert Lighthizer Robert (Bob) Emmet LighthizerWhiskey, workers and friends caught in the trade dispute crossfire GOP senator warns quick vote on new NAFTA would be 'huge mistake' Pelosi casts doubt on USMCA deal in 2019 MORE, Energy Secretary Rick Perry Rick PerryEnergy secretary questions consensus that humans cause climate change OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project MORE and Acting Attorney General Matthew Whitaker.

— Updated 9:18 p.m.