The grand jury convened by special counsel Robert Mueller in his investigation into possible collusion between the Trump campaign and Russia will soon have the chance to question associates of former national security adviser Mike Flynn.

NBC News reports Bijan Kian, an Iranian-American businessman and former board member of the Export-Import bank who once worked at Flynn's now-defunct lobbying firm, the Flynn Intel Group, is a subject of Mueller's probe.

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Mueller recently indicted former Trump campaign chairman Paul Manafort and a business associate, Rick Gates, on counts including tax fraud and money laundering, tied to their lobbying work.

Previous reports have claimed that Mueller's team has enough evidence to indict Flynn and his son, who both worked for the Trump campaign.

At issue is whether they failed to properly disclose lobbying work for foreign governments.

Mueller's team is specifically looking into Kian's role in a contract that "could be construed to have principally benefited the Republic of Turkey," according to necessary paperwork under the Foreign Agents Registration Act (FARA) that was filed months after the deal was made.

Kian was also present for a 2016 meeting between Flynn and Rep. Dana Rohrabacher Dana Tyrone RohrabacherDemocrat Harley Rouda advances in California House primary Lawyers to seek asylum for Assange in France: report Rohrabacher tells Yahoo he discussed pardon with Assange for proof Russia didn't hack DNC email MORE (R-Calif.), a pro-Russia lawmaker, according to emails obtained by the special counsel's office.

Flynn, who actively campaigned for Trump during the election, was briefly Trump's national security adviser before he was fired for misleading Vice President Mike Pence Michael (Mike) Richard PenceGardner signals support for taking up Supreme Court nominee this year Biden leads Trump by 12 points among Catholic voters: poll GOP brushes back charges of hypocrisy in Supreme Court fight MORE about his contacts with Russian Ambassador Sergey Kislyak.

The retired Army lieutenant general previously sought to testify before Congress in exchange for immunity.

“General Flynn certainly has a story to tell, and he very much wants to tell it, should the circumstances permit,” his lawyer said in March.