Sources say Mueller also has enough evidence to charge Flynn's son, Michael G. Flynn.
While it's unclear whether the request came from Flynn, Mueller's team appears to be interested in allegations made by ex-C.I.A. director James Woolsey that Flynn talked with Turkish officials about kidnapping Gulen in September 2016.
Mueller is pressuring Flynn to cooperate with the investigation and is apparently using the former national security adviser's son as leverage.
Flynn would be the first member of the Trump administration to be charged, if he is indicted.
It was reported that Mr Flynn could face less severe charges if he cooperates with Mr Mueller's team and that could also benefit his son. The Justice Department believed Flynn was thus vulnerable to blackmail as a result.
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Flynn's lawyer Robert Kelner declined to comment when asked if Flynn denies any collusion with Russian Federation during the 2016 election.
Investigators are interested in whether Flynn laundered money or lied to federal agents about his overseas contacts, three sources close to the investigation told the network.
Mueller is leaning on Flynn to reveal more about the Trump campaign's ties to Russian Federation, and may use his son as a means of leverage. Flynn's son briefly served on the Trump transition team, while his father served as national security adviser for less than a month.
Additionally, on Monday, investigators revealed that an unpaid foreign policy adviser for the Trump campaign, George Papadopolous, had pleaded guilty to lying to federal officials. The retired army lieutenant general was sacked in February after less than a month on the job after it was revealed he had lied to Vice President Mike Pence about the extent of his dealings and communications with Russian Ambassador to the U.S. Sergey Kislyak. But cooperation from Flynn, who was national security adviser for only 24 days before he was sacked, could help his son avoid the worst penalties.