Donald Trump announced on Wednesday he was appointing David Warrington to serve as the White House counsel, abruptly changing his mind about who will be the top lawyer in the incoming administration as he moves his original pick to the new department of government efficiency.

The move means Warrington, a longtime Trump lawyer who was also the Trump campaign’s general counsel, will effectively be the most prominent legal adviser to Trump in the day-to-day running of the West Wing.

“Dave will lead the office of the White House counsel, and serve as the top attorney in the White House. Dave has represented me well as my personal attorney, and as general counsel for my presidential campaign,” Trump said in a Truth Social post.

Warrington has been a low-profile but consistent fixture in Trump’s legal orbit for years, leading the campaign’s pre-election litigation with the federal election commission and civil cases, including efforts to ban Trump from the ballot over the January 6 Capitol attack.

Warrington had been in contention to be White House counsel in the days after the election – it is typical for the general counsel on the presidential campaign to get the White House counsel job – until Trump decided he wanted the Republican lawyer Bill McGinley instead.

The precise details about why Trump changed his mind are unclear. But the decision reflects the shifting power dynamics inside Trump’s orbit in the weeks before he takes office.

The Trump transition team’s “War Room” account said in a post on X that McGinley was moved to the department of government efficiency because the agency, which is expected to be part of the Office of Management and Budget, needed its own lawyer to oversee efforts to cut millions in government spending.

“President Trump knows reforming the federal government won’t be easy – and that’s why he needs a solid, experienced pro like Bill McGinley at DOGE,” the post said, using the acronym for the efficiency department.

But the decision also comes after Warrington, in the lead-up to the Thanksgiving holiday last week, attempted what was widely seen as an effort to force the exile of top Trump adviser Boris Epshteyn over an alleged pay-to-play scheme for potential cabinet nominees.

The apparent ouster attempt failed and Epshteyn has remained inside Trump’s orbit. Several Trump aides suggested Warrington might have been offered the White House counsel job as part of a detente inside the Trump legal teams, so that Warrington got what he wanted and Epshteyn retained his influence.

“Bill will play a crucial role in liberating our economy from burdensome regulations, excess spending, and government waste. He will partner with the White House and the Office of Management and Budget to provide advice and guidance to end the bloated federal bureaucracy,” Trump said.

The White House counsel role is not a Senate-confirmed position. Warrington would be part of a West Wing senior staff led by the White House chief of staff Susie Wiles, the co-chair of the Trump campaign with whom he has worked closely.