The news comes less than a week after Trump's former campaign manager Paul Manafort was arrested on charges stemming from Mueller's probe into Russian interference in the 2016 presidential election.
Earlier this week, Professor Jacobson noted that Special Counsel Robert Mueller's investigation is focused on process crimes and other things unrelated to the goal of the Trump campaign-Russia collusion investigation.
However, according to NBC, Mueller's investigation is scrutinizing Flynn's lobbying work, investigating whether or not he laundered money and probing whether or not he lied to federal investigators about overseas contacts.
Mueller's investigation, which is being carried out on behalf of the US Department of Justice, has already indicted three members of Trump's campaign team. It was also unveiled that George Papadopoulos, a former Trump foreign policy adviser, pleaded guilty over the summer to lying to federal prosecutors.
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Mr Gullen is a rival of Recep Erdogan, the Turkish President. Flynn's son, Michael G. Flynn, worked closely with his father and the two could be indicted at the same time. Alptekin is also the head of Inovo, a consulting firm. While NBC's sources have not indicated what charges could be filed against both men, it appears as if the elder Flynn's initial failure to register as a foreign lobbyist of Turkey has been a subject of the investigation.
It seems some in Washington weren't surprised by reports signaling Trump's former national security adviser may be the next person to face charges in Mueller's prove.
Although Flynn's group's initial stated goal in hiring SGR was to foster a stronger business climate in Turkey, it was later forced to indicate that it brought SGR on to "raise concerns" to the USA about Gulen. More likely though, Flynn's son is a pawn to be used to get Flynn to talk.
At issue is Flynn's lobbying work. Officials told NBC News that any quid-pro-quo agreement between Flynn and the Turkish government would be illegal. The FBI pushed back against the request because there was no new information.