Paul Manafort, advisor to Donald Trump, is seen on the floor of the Quicken Loans Arena at the Republican National Convention in Cleveland, Ohio, July 19, 2016.
Tom Williams/CQ-Roll Call,Inc.
Paul Manafort, advisor to Donald Trump, is seen on the floor of the Quicken Loans Arena at the Republican National Convention in Cleveland, Ohio, July 19, 2016.
Now playing
01:25
Manafort's journey to center of Mueller's investigation
Paul Manafort attorney statement vpx _00003417.jpg
CNN
Paul Manafort attorney statement vpx _00003417.jpg
Now playing
00:35
Attorney explains why Manafort pleaded guilty
Getty Images
Now playing
01:05
Remind me ... who is Paul Manafort?
CLEVELAND, OH - JULY 17:  Paul Manafort, campaign manager for Republican presidential candidate Donald Trump, is interviewed on the floor of the Republican National Convention at the Quicken Loans Arena  July 17, 2016 in Cleveland, Ohio. The Republican National Convention begins tomorrow.  (Photo by Win McNamee/Getty Images)
Win McNamee/Getty Images
CLEVELAND, OH - JULY 17: Paul Manafort, campaign manager for Republican presidential candidate Donald Trump, is interviewed on the floor of the Republican National Convention at the Quicken Loans Arena July 17, 2016 in Cleveland, Ohio. The Republican National Convention begins tomorrow. (Photo by Win McNamee/Getty Images)
Now playing
01:21
Mueller team: Manafort agrees to plead guilty
Former Trump campaign chairman Paul Manafort leaves Federal Court on December 11, 2017 in Washington, DC.
In October, Trump's one-time campaign chairman Paul Manafort and his deputy Rick Gates were arrested on money laundering and tax-related charges. Brendan Smialowski/AFP/Getty Images
Brendan Smialowski/AFP/Getty Images
Former Trump campaign chairman Paul Manafort leaves Federal Court on December 11, 2017 in Washington, DC. In October, Trump's one-time campaign chairman Paul Manafort and his deputy Rick Gates were arrested on money laundering and tax-related charges. Brendan Smialowski/AFP/Getty Images
Now playing
02:34
Manafort found guilty on 8 counts
Juror Manafort
FOX NEWS
Juror Manafort
Now playing
01:14
Juror from Paul Manafort trial speaks out
CNN Illustration/Getty Images
Now playing
01:53
What the Manafort and Cohen case results mean
juror Paula Duncan
CNN
juror Paula Duncan
Now playing
01:34
Juror: Manafort pardon would be grave mistake
President Trump departs the White House South Lawn.
CNN
President Trump departs the White House South Lawn.
Now playing
01:43
Trump: Manafort trial is very sad
Paul Manafort arrives for a hearing at US District Court on June 15, 2018 in Washington, DC. (Photo by Brendan SMIALOWSKI / AFP)        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
BRENDAN SMIALOWSKI/AFP/AFP/Getty Images
Paul Manafort arrives for a hearing at US District Court on June 15, 2018 in Washington, DC. (Photo by Brendan SMIALOWSKI / AFP) (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Now playing
02:12
Prosecutors: Manafort case all about 'lies'
Bill Hennessy
Now playing
01:16
Prosecution rests their case in Manafort trial
Bill Hennessy
Now playing
02:23
Banker testifies after unexplained recess
Bill Hennessy
Now playing
00:53
Day 9 of Manafort trial begins with mystery
Bill Hennessy
Now playing
02:23
Judge: 'Probably wrong' to scold prosecutors
Bill Hennessy
Now playing
02:57
Frustrated Manafort emailed Gates: WTF?
(CNN) —  

The Special Counsel’s Office is hoping to deny an attempt by several media organizations, including CNN, to unseal documents in the Russia probe, by arguing that the documents need to remain private because of the breadth of still-secret parts of the ongoing investigation.

“The Special Counsel’s investigation is not a closed matter, but an ongoing criminal investigation with multiple lines of non-public inquiry. No right of public access exists to search warrant materials in an ongoing investigation,” Robert Mueller’s team wrote in a filing Wednesday night.

The prosecutors wrote in the firmest language yet about how their yearlong investigation into Russian interference in the 2016 US election continues and includes several interconnected parts, some of which may link back to searches of the belongings of former Trump campaign chairman Paul Manafort that were also used to build cases against him unrelated to his work for the campaign.

Manafort faces criminal indictments in Virginia and DC federal courts related to his foreign lobbying business from before the campaign. He’s pleaded not guilty in both.

Prosecutors have previously revealed that the Justice Department directed Mueller to look into allegations that Manafort coordinated with Russians during the campaign, yet they have not previously hinted that others besides Manafort could be central to the Russia probe. Wednesday’s court filing acknowledges multiple relationships that are part of investigative threads.

“The investigation consists of multiple lines of inquiry within the overall scope of the Special Counsel’s authority. Many aspects of the investigation are factually and legally interconnected: they involve overlapping courses of conduct, relationships, and events, and they rely on similar sources, methods, and techniques. The investigation is not complete and its details remain non-public,” prosecutors wrote.

If they were to be unsealed, “warrant materials reveal investigative sources and methods, preliminary factual and legal theories, and evidence that has already been gathered – including from grand jury processes. They show what has been searched – including electronic facilities where the search itself is protected by a non-disclosure order – and indicate what has not been searched. And the dates and volume of warrants reveal an investigation’s direction.”

The Special Counsel’s Office said it wouldn’t oppose formally unsealing two search warrants that were made public through recent court filings in Manafort’s case, though parts of them remain heavily redacted.

CNN, along with The Associated Press, Politico, The Washington Post and The New York Times, initially asked the court to unseal all the search warrants used in the investigations and other sealed documents related to Manafort’s two federal criminal cases.