President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE announced Wednesday that White House counsel Don McGahn would be leaving his position in the fall.

Trump made the abrupt announcement on Twitter, writing that McGahn would leave after Supreme Court nominee Brett Kavanaugh's expected confirmation.

"I have worked with Don for a long time and truly appreciate his service!" Trump wrote.

White House Counsel Don McGahn will be leaving his position in the fall, shortly after the confirmation (hopefully) of Judge Brett Kavanaugh to the United States Supreme Court. I have worked with Don for a long time and truly appreciate his service!

McGahn has played a central role in the administration’s efforts to appoint conservative judges to federal courts. Those who worked closely with McGahn also describe him as a steady force in a White House increasingly embroiled in chaos.

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“The White House Counsel’s office is an island of competence and professionalism in an otherwise chaotic and amateurish West Wing,” said a former White House official who worked with the counsel’s office regularly. “It will be a tremendous loss and you have to wonder if this well-oiled machine starts to sputter a bit after he leaves.”

Still, the source acknowledged that McGahn and Trump often left one another “frustrated."

The Washington Post reported that even McGahn was surprised by Trump’s announcement Wednesday morning. According to the Post, while it was known in the West Wing that McGahn planned to leave after Kavanaugh’s confirmation process, he had not yet discussed it personally with Trump.

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Trump has not chosen someone to fill McGahn's role when he leaves, according to an Axios report earlier Wednesday.

McGahn is poised to leave his position just weeks after The New York Times reported that the White House counsel had cooperated extensively with special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE as part of his investigation into Russian interference in the election, including on the line of inquiry as to whether Trump obstructed justice.

Among other topics, McGahn reportedly discussed the president's dismissal of former FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE and his repeated urging of Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE to take oversight of the special counsel, despite Sessions's recusal from the Russia probe.

Trump later claimed to have allowed McGahn and other members of the White House staff to “fully cooperate” with Mueller, whose investigation the president has regularly derided as a political "witch hunt."

“I allowed White House Counsel Don McGahn, and all other requested members of the White House Staff, to fully cooperate with the Special Counsel,” Trump tweeted earlier this month. “In addition we readily gave over one million pages of documents. Most transparent in history. No Collusion, No Obstruction. Witch Hunt!”

There have been signs of tumult between McGahn and Trump for several months. The Times also reported in January that McGahn had threatened to resign at one point when Trump broached firing Mueller.

Trump later on Wednesday described McGahn as an “excellent guy” for whom he has “a lot of affection.”

“Don McGahn is a really good guy, been with me a long time,” Trump told reporters at an event rolling out a drug-free communities support program at the White House.

When asked whether he was concerned about what the White House counsel said to Mueller, Trump replied, “No, not at all.”

The president’s public attacks on Mueller have only escalated in recent weeks, as the special counsel’s team litigated its first case against former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE. Last week, a jury in Alexandria, Va., convicted Manafort on eight counts of tax and bank fraud.

McGahn worked on Trump’s 2016 presidential campaign before joining to the White House. As the White House counsel, he is tasked with advising Trump and other members of the White House staff on legal issues that involve the administration.

Updated at 1:05 p.m.