The revelation of the plea negotiation comes on the heels of an announcement from Corsi last week that after two months of closed-door talks with investigators, Mueller had indicated to him that he would be charged within a matter of days.
On Friday, Corsi confirmed to The Associated Press he is in talks to reach a deal with prosecutors in Mueller's office and declined to discuss the matter further.
Earlier this month, Corsi said that he expected to be indicted, and according to the Associated Press, he has been cooperating with the Russian Federation probe since late August. The potential charges could be related to false statements he made about his relationship with WikiLeaks and Stone. Corsi said he had been contacted by the special counsel about possible charges, and the special counsel and Corsi's attorney had been in ongoing discussions.
The special counsel is scrutinizing whether Corsi and Stone coordinated with WikiLeaks ahead of its mass releases of Podesta's emails.
At issue is Stone's connections with WikiLeaks. Not long after that, WikiLeaks started releasing thousands of Podesta's hacked emails.
In a brief phone call with the AP, Corsi declined to elaborate on the details of any plea deal or say if a court hearing had been set.
Corsi did research on Democrats during the 2016 election and provided it to Stone, who served as an informal adviser to Trump's campaign at the time.
"It is clear from his recent videos and his recent interviews that my friend Dr. Corsi has been under a tremendous amount of pressure and it is beginning to affect him profoundly", he said in a statement to the outlet, before adding Corsi's had been asked to "say things he simply doesn't believe occurred". Those people, who continue to share information in several investigations, according to the Justice Department, are former Trump campaign deputy Rick Gates, former Trump campaign chairman Paul Manafort, former Trump national security adviser Michael Flynn, Trump's personal lawyer Michael Cohen and lobbyist Sam Patten.