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's team has started writing its final report after a months-long investigation into possible ties between President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's presidential campaign and Russia, multiple sources told CNN on Thursday.

Trump began reviewing his answers to Mueller's questions as he prepared to request 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's resignation, CNN reported.

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A source familiar with the matter told CNN that they believe the Trump legal team will continue to approach Mueller's questions the same way, despite the shakeup in leadership at the Justice Department.

Trump agreed to answer written questions from the special counsel, but the two teams have not settled negotiations over a possible in-person interview, according to CNN. Trump's legal team and attorneys representing witnesses in the investigation say Trump's responses to the special counsel could point to the imminent conclusion of Mueller's 18-month probe, the network reported.

The special counsel's office declined to comment to The Hill.

Mueller reportedly was expected to release his findings related to key aspects of his investigation into Russian election interference in 2016 after Tuesday's midterm elections.

Shortly after Sessions's ousting, Trump named Matthew Whitaker as acting attorney general, sparking concerns among Democrats that the president could be seeking to undermine Mueller's probe.

Whitaker, who has publicly criticized Mueller's probe and defended Trump — including in op-eds to CNN and The Hill — will oversee Mueller's investigation.

Top Democratic leaders, including House Minority Leader Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (Calif.), have called on Whitaker to recuse himself from oversight over his public comments criticizing the special counsel.

"Given his record of threats to undermine & weaken the Russia investigation, Matthew Whitaker should recuse himself from any involvement in Mueller’s investigation," Pelosi said. "Congress must take immediate action to protect the rule of law and integrity of the investigation. #FollowTheFacts."

It is impossible to read Attorney General Sessions’ firing as anything other than another blatant attempt by @realDonaldTrump to undermine & end Special Counsel Mueller’s investigation. — Nancy Pelosi (@NancyPelosi) November 7, 2018

Democrats on the House Judiciary Committee on Thursday called for an emergency hearing following Sessions's resignation.

Committee Democrats sent letters to the panel's GOP chairman and Whitaker, pressing them on how the shakeup at the highest levels of the Justice Department will impact Mueller's investigation.

Whitaker, in an op-ed for The Hill last year, criticized the idea of a special counsel, dismissing the call for an independent counsel as partisan.

"Calls for an independent counsel or commission to investigate allegations that Russia tried to interfere with our elections ring hollow when similar calls for special counsels during the scandals of the Obama administration were dismissed out of hand by the same people making these demands now," Whitaker wrote at the time.

Olivia Beavers contributed reporting.