President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s lead personal attorney handling the investigation into Russian meddling abruptly resigned on Thursday.

John Dowd, a prominent white-collar attorney who joined Trump’s legal team last summer, will step down after breaking with the president on key elements surrounding the probe, including whether Trump should sit for an interview with 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.

“I love the President and I wish him well,” Dowd said in a written statement to The Hill.

Dowd’s exit comes as the president seeks to shake up his legal team amid frustrations within the White House over Mueller’s probe, which has cast a cloud over the administration for more than a year now.

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This week, Trump added Joseph diGenova, a former U.S. attorney who has been highly critical of the FBI and Department of Justice (DOJ), to his outside legal team. With Dowd gone, Trump’s outside legal team handling the Russia matter will be led, at least in the interim, by diGenova and Jay Sekulow.

"John Dowd is a friend and has been a valuable member of our legal team,” Sekulow said in a statement to The Hill. “We will continue our ongoing representation of the president and our cooperation with the office of the special counsel."

Trump extended an offer to prominent Washington attorney Theodore Olson earlier this week. Olsen declined, but the president could still be looking to bolster his roster of outside attorneys following Dowd's exit.

Dowd sent Washington into a frenzy over the weekend when he released a statement calling for an end to the special counsel probe, signaling a more aggressive posture by Trump’s team toward the investigation.

Dowd publicly pressured Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE to “bring an end to the alleged Russia collusion investigation” that he said had been “manufactured” by former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE and former FBI Deputy Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE, who Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE fired last week.

That statement came ahead of a blistering string of tweets from Trump, in which he attacked Mueller by name for the first time. Trump accused Mueller of stocking his special counsel team with “hardened Democrats” and called the investigation a “witch hunt” that is rife with “massive conflicts of interest.”

Those remarks ignited speculation over whether Trump was preparing to fire Mueller.

The White House insists that there have been no discussions about that. But at a briefing this week, press secretary Sarah Huckabee Sanders vented frustration with the probe.

Sanders blasted GOP lawmakers, like Rep. Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.), who have said that Trump’s attacks on Mueller make it look like he has something to hide.

“To pretend like going through this absurd process over a year would not bring frustration seems a little ridiculous,” Sanders said.

“I don't think any individual, including members of Congress, would like it if they had been accused of taking their seat in Congress by doing something nefarious when they hadn't, particularly if it went on for more than a year into their time in office," she said.

But Sanders said that firing Mueller “would not be the most productive step forward.”

The White House position has long been that it will cooperate with the special counsel in hopes of bringing the investigation to a speedy conclusion.

But outside of the White House, Trump’s legal team has been more aggressive.

DiGenova has fiercely defended Trump in conservative media while attacking the FBI and DOJ. He has described Comey as the “dirtiest cop in America.”

Sekulow has been a similarly vocal attack dog for the president, decrying alleged anti-Trump bias at the FBI and DOJ and demanding a second special counsel investigation in appearances on Fox News’s “Hannity” and on his own radio show.

Dowd had cut a lower profile among Trump’s outside personal attorneys and reportedly broke with the president over whether to sit for an interview with Mueller.

When Trump announced to reporters earlier this year that he was eager to speak under oath to the special counsel, Dowd sought to throw cold water on idea.

His departure comes as Trump’s in-house legal team, led by Ty Cobb, is negotiating the parameters of a possible meeting between Trump and Mueller.

There are concerns among some of Trump’s allies that the president would be at risk of making a false statement to investigators in a freewheeling conversation. White House lawyers are seeking to limit the scope of Mueller’s questions and potentially provide written, rather than verbal, answers on some matters.

Cobb has been trying to reassure the president that the investigation will be over soon.

Since last fall, Cobb has predicted that the investigation would end by Thanksgiving, Christmas or the New Year. Cobb’s team has been in a holding pattern, believing it has turned over everything Mueller has requested.

But media reports indicate that the probe has expanded to include Trump’s business empire, the business dealings of his son-in-law and senior adviser Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, and overseas meetings between the president’s supporters that took place after the election.

That has generated concern at the White House about the scope and length of the investigation.

-Updated 12:26 p.m.