The retired lieutenant general had admitted lying to Vice President Mike Pence about a meeting with the Russian ambassador in which the lifting of United States sanctions was discussed.
Flynn, who is President Trump's former national security adviser, and his son Michael Flynn Jr. were allegedly were involved in a plan to deliver Fethullah Gulen to the Turkish government, which views Gulen as a political enemy and has pressed the USA for his extradition, The Journal reported.
Former national security adviser Michael Flynn and his son met with members of the Turkish government last December to discuss a plan to kidnap a political enemy of Turkey's president in exchange for millions of dollars, according to two new reports.
The Journal cited "people with knowledge of the FBI's inquiries" saying the bureau is asking individuals about a December meeting in New York City with Flynn and Turkish government representatives where Gulen's removal was discussed.
Michael Flynn talks to media as he arrives with is son (l.) at Trump Tower on November 17, 2016.
The alleged December meeting followed one on September 19 attended by people including Berat Albayrak, who is Turkey's energy minister and the son-in-law of Erdogan, and Foreign Minister Mevlut Cavusoglu, according to the Journal.
Flynn and others also are under investigation for allegedly plotting to free a Turkish-Iranian gold trader who is jailed in the U.S.
Erdogan has long sought Gulen's extradition for inciting a coup attempt in 2016, something Gulen has long denied. Friday's report describes a second meeting involving both Flynns at the 21 Club restaurant, a prohibition-era NY speakeasy patronised by Trump, in mid-December.
Flynn could even face charges of violating counterespionage laws if prosecutors established he was accepting undisclosed payments at the same time he was receiving classified security briefings as part of the Trump transition, Cotter said.
Participation in an effort to snatch Gulen in the USA could expose Flynn to an assortment of federal charges. The younger Flynn worked closely with his father at his lobbying firm, Flynn Intel Group. Flynn then retroactively registered as a foreign agent. Flynn penned an op-ed last November suggesting the US should expel Gulen.
Mueller, who is charged with investigating "any matters" that arise out of his probe into Russian interference in the 2016 election and possible collusion between President Donald Trump's campaign and Russia, has reportedly compiled enough evidence to bring charges against Flynn and his son, according to NBC News.