Dana J. Boente (R), U.S. Attorney for the Eastern District of Virginia, and Andrew G. McCabe (L), Assistant Director in Charge of the FBI's Washington Field Office, after a hearing in federal court June 11, 2015 in Alexandria, Virginia. Officials announced that earlier today 17-year-old Virginia high school student Ali Shukri Amin pleaded guilty to helping a classmate travel to Syria in hopes of joining ISIS.  (Photo by Mark Wilson/Getty Images)
Mark Wilson/Getty Images
Dana J. Boente (R), U.S. Attorney for the Eastern District of Virginia, and Andrew G. McCabe (L), Assistant Director in Charge of the FBI's Washington Field Office, after a hearing in federal court June 11, 2015 in Alexandria, Virginia. Officials announced that earlier today 17-year-old Virginia high school student Ali Shukri Amin pleaded guilty to helping a classmate travel to Syria in hopes of joining ISIS. (Photo by Mark Wilson/Getty Images)
Now playing
02:31
NYT: McCabe wrote secret memo detailing Comey firing
WASHINGTON, DC - MAY 11:  Acting FBI Director Andrew McCabe testifies before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security.  (Photo by Alex Wong/Getty Images)
Alex Wong/Getty Images
WASHINGTON, DC - MAY 11: Acting FBI Director Andrew McCabe testifies before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security. (Photo by Alex Wong/Getty Images)
Now playing
01:11
Who is Andrew McCabe?
WASHINGTON, DC - JUNE 21:  Acting FBI Director Andrew McCabe testifies before a House Appropriations subcommittee meeting on the FBI's budget requests for FY2018 on June 21, 2017 in Washington, DC. McCabe became acting director in May, following President Trump's dismissal of James Comey.  (Photo by Pete Marovich/Getty Images)
Pete Marovich/Getty Images North America/Getty Images
WASHINGTON, DC - JUNE 21: Acting FBI Director Andrew McCabe testifies before a House Appropriations subcommittee meeting on the FBI's budget requests for FY2018 on June 21, 2017 in Washington, DC. McCabe became acting director in May, following President Trump's dismissal of James Comey. (Photo by Pete Marovich/Getty Images)
Now playing
02:01
Report cites lack of candor by Andrew McCabe
WASHINGTON, DC - MAY 11:  Acting FBI Director Andrew McCabe testifies before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security.  (Photo by Alex Wong/Getty Images)
Alex Wong/Getty Images
WASHINGTON, DC - MAY 11: Acting FBI Director Andrew McCabe testifies before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security. (Photo by Alex Wong/Getty Images)
Now playing
01:57
Justice IG submits criminal referral on McCabe
WASHINGTON, DC - JULY 13:  Acting FBI Director Andrew McCabe listens during a news conference to announce significant law enforcement actions July 13, 2017 at the Justice Department in Washington, DC. Attorney General Jeff Sessions held the news conference to announce the 2017 health care fraud takedown.  (Photo by Alex Wong/Getty Images)
Alex Wong/Getty Images
WASHINGTON, DC - JULY 13: Acting FBI Director Andrew McCabe listens during a news conference to announce significant law enforcement actions July 13, 2017 at the Justice Department in Washington, DC. Attorney General Jeff Sessions held the news conference to announce the 2017 health care fraud takedown. (Photo by Alex Wong/Getty Images)
Now playing
00:58
Flake on McCabe firing: Horrible day for democracy
ALEXANDRIA, VA - JUNE 11: Andrew G. McCabe (R), Assistant Director of the FBI's Washington Field Office speaks while flanked by Dana J. Boente (L),U.S. Attorney for the Eastern District of Virginia, after a hearing in federal court June 11, 2015 in Alexandria, Virginia. Officials announced that earlier today 17-year-old Virginia high school student Ali Shukri Amin pleaded guilty to helping a classmate travel to Syria in hopes of joining ISIS.  (Photo by Mark Wilson/Getty Images)
Mark Wilson/Getty Images/FILE
ALEXANDRIA, VA - JUNE 11: Andrew G. McCabe (R), Assistant Director of the FBI's Washington Field Office speaks while flanked by Dana J. Boente (L),U.S. Attorney for the Eastern District of Virginia, after a hearing in federal court June 11, 2015 in Alexandria, Virginia. Officials announced that earlier today 17-year-old Virginia high school student Ali Shukri Amin pleaded guilty to helping a classmate travel to Syria in hopes of joining ISIS. (Photo by Mark Wilson/Getty Images)
Now playing
02:28
Could congressman's offer save McCabe's pension?
WASHINGTON, DC - MAY 23: Former Director of the U.S. Central Intelligence Agency (CIA) John Brennan testifies before the House Permanent Select Committee on Intelligence on Capitol Hill, May 23, 2017 in Washington, DC. Brennan is discussing the extent of Russia's meddling in the 2016 U.S. presidential election and possible ties to the campaign of President Donald Trump. (Photo by Drew Angerer/Getty Images)
Drew Angerer/Getty Images
WASHINGTON, DC - MAY 23: Former Director of the U.S. Central Intelligence Agency (CIA) John Brennan testifies before the House Permanent Select Committee on Intelligence on Capitol Hill, May 23, 2017 in Washington, DC. Brennan is discussing the extent of Russia's meddling in the 2016 U.S. presidential election and possible ties to the campaign of President Donald Trump. (Photo by Drew Angerer/Getty Images)
Now playing
01:40
Ex-CIA chief to Trump: US will triumph over you
WASHINGTON, DC - JUNE 21:  Acting FBI Director Andrew McCabe testifies before a House Appropriations subcommittee meeting on the FBI's budget requests for FY2018 on June 21, 2017 in Washington, DC. McCabe became acting director in May, following President Trump's dismissal of James Comey.
Pete Marovich/Getty Images North America
WASHINGTON, DC - JUNE 21: Acting FBI Director Andrew McCabe testifies before a House Appropriations subcommittee meeting on the FBI's budget requests for FY2018 on June 21, 2017 in Washington, DC. McCabe became acting director in May, following President Trump's dismissal of James Comey.
Now playing
01:06
Journalist: The real reason Trump wanted McCabe fired
douglas brinkley ctn
douglas brinkley ctn
Now playing
02:07
Historian: This is 'Friday Night Slaughter'
Getty Images/Chris Kleponis-Pool/Chip Somodevilla
Now playing
01:57
Trump celebrates McCabe firing on Twitter
WASHINGTON, DC - MAY 11:  Acting FBI Director Andrew McCabe testifies before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security.  (Photo by Alex Wong/Getty Images)
Alex Wong/Getty Images
WASHINGTON, DC - MAY 11: Acting FBI Director Andrew McCabe testifies before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security. (Photo by Alex Wong/Getty Images)
Now playing
02:30
McCabe denies he misled investigators
Acting Director of the Federal Bureau of Investigation (FBI) Andrew McCabe speaks during a press conference at the US Department of Justice in Washington, DC, on July 13, 2017.
JIM WATSON/AFP/Getty Images
Acting Director of the Federal Bureau of Investigation (FBI) Andrew McCabe speaks during a press conference at the US Department of Justice in Washington, DC, on July 13, 2017.
Now playing
01:25
Sessions fires FBI's Andrew McCabe
WASHINGTON, DC - MAY 11:  Acting FBI Director Andrew McCabe testifies before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security.  (Photo by Alex Wong/Getty Images)
Alex Wong/Getty Images
WASHINGTON, DC - MAY 11: Acting FBI Director Andrew McCabe testifies before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security. (Photo by Alex Wong/Getty Images)
Now playing
01:57
McCabe learned he was fired from media reports
ALEXANDRIA, VA - JUNE 11:  Andrew G. McCabe (R), Assistant Director of the FBI's Washington Field Office speaks while flanked by Dana J. Boente (L), U.S. Attorney for the Eastern District of Virginia, after a hearing in federal court June 11, 2015 in Alexandria, Virginia. Officials announced that earlier today 17-year-old Virginia high school student Ali Shukri Amin pleaded guilty to helping a classmate travel to Syria in hopes of joining ISIS.  (Photo by Mark Wilson/Getty Images)
Mark Wilson/Getty Images/FILE
ALEXANDRIA, VA - JUNE 11: Andrew G. McCabe (R), Assistant Director of the FBI's Washington Field Office speaks while flanked by Dana J. Boente (L), U.S. Attorney for the Eastern District of Virginia, after a hearing in federal court June 11, 2015 in Alexandria, Virginia. Officials announced that earlier today 17-year-old Virginia high school student Ali Shukri Amin pleaded guilty to helping a classmate travel to Syria in hopes of joining ISIS. (Photo by Mark Wilson/Getty Images)
Now playing
02:52
Conservative media: McCabe part of 'deep state'
WASHINGTON, DC - JUNE 21:  Acting FBI Director Andrew McCabe testifies before a House Appropriations subcommittee meeting on the FBI's budget requests for FY2018 on June 21, 2017 in Washington, DC. McCabe became acting director in May, following President Trump's dismissal of James Comey.
Pete Marovich/Getty Images North America
WASHINGTON, DC - JUNE 21: Acting FBI Director Andrew McCabe testifies before a House Appropriations subcommittee meeting on the FBI's budget requests for FY2018 on June 21, 2017 in Washington, DC. McCabe became acting director in May, following President Trump's dismissal of James Comey.
Now playing
01:04
FBI deputy director McCabe stepping down
CNN —  

Former FBI Deputy Director Andrew McCabe has turned over a memo he drafted related to the firing of his former boss, FBI Director James Comey, to the special counsel’s office, according to a source familiar with the matter.

The document, first reported by The New York Times, details McCabe’s impressions of a meeting with Deputy Attorney General Rod Rosenstein where the subject of Comey’s firing came up after he had been dismissed, according to the source.

In the meeting, Rosenstein said President Donald Trump had initially asked him to reference the Russia investigation. Rosenstein ultimately authored a controversial memo outlining the ways Comey had flouted Justice Department protocols leading up to the 2016 election but did not mention the Russia probe.

The source confirmed to CNN that McCabe’s memo recounting this meeting with Rosenstein, as well as an early draft of Trump’s letter firing Comey, has been turned over to special counsel Robert Mueller. What exactly Trump’s draft letter says and when it was turned over remain unclear.

The President and his allies have pointed to Rosenstein’s memo in the past, questioning why he has not stepped aside from overseeing Mueller’s investigation given his role in the firing of Comey.

But CNN reported in April that Rosenstein has consulted with the career ethics adviser at the Justice Department about this issue and continues to oversee the probe.

The Justice Department declined to comment.

As CNN previously reported, McCabe has turned over his other contemporaneous notes to Mueller, which detail what Comey shared with McCabe about his private interactions with Trump while he was FBI director.