Mr Mueller is conducting a federal investigation into whether or not collusion occurred between Donald Trump’s 2016 presidential election marketing campaign and Russian international brokers.
The official has already charged dozens of people with crimes starting from fraud to election interference.
Mr Mueller has referred varied people to the US Attorney’s Office for the Southern District of New York (SDNY) since presenting a case involving President Trump’s former lawyer, Michael Cohen.
This has included Democratic lobbyist Tony Podesta and his former agency, Podesta Group, and Republican consultant from Minnesota Vin Weber, and his work for Mercury Public Affairs, based on sources who spoke to CNN.
Another supply indicated that former White House counsel in the course of the Obama administration Greg Craig, a companion within the regulation agency Skadden, Arps, Slate, Meagher & Flom LLP, can be a part of the enquiry.
There is at present no indication why Mr Mueller referred the instances to New York prosecutors.
None of the people concerned within the case have been charged, and there’s no indication that the enquiries carried out by the SDNY will lead to any felony fees.
All the enquiries are regarding whether or not the people performed work on behalf of organisation related to Ukraine with out correctly registering as international brokers with the Justice Department.
US regulation stipulates that a person representing a international authorities or political celebration should file public stories outlining their relationship.
Both Craig and Skadden declined to touch upon the problem.
Michael McKeon, a companion at Mercury Public Affairs, advised CNN: “We welcome any inquiry, as we all the time have, since we acted appropriately at each step of the method, together with hiring the most effective lawyer in Washington we may and following his recommendation.”
The Podesta Group acknowledged they have been absolutely cooperating with Mr Mueller’s enquiry, and famous they did not register as a international agent because of false data offered by the European Centre for a Modern Ukraine.
The group claimed they registered their work with the US Congress because of data offered by the organisation, which prompt it was not an arm of the Ukrainian authorities.
Mr Mueller can be finishing up an enquiry into President Trump’s former marketing campaign chairman Paul Manafort and his affiliate Paul Gates.
They have been each charged by Mr Mueller for failing to declare themselves as international brokers regarding work carried out for the Party of Regions, a pro-Russian political celebration in Ukraine.
Mr Manafort pleaded not responsible and faces trial, whereas Mr Gates pleaded responsible.