The attorneys for Mr. Flynn and Mr. Trump declined to comment. The four people informed on the matter spoke on condition of anonymity because they were not authorized to discuss the matter publicly.
A deal with Mr. Flynn would give Mr. Mueller a behind-the-scenes look at the Trump campaign and the administration's tumultuous early weeks. Mr. Flynn was an early and important advisor to Mr. Trump, architect of Mr. Trump's populist platform "America First" and advocate for closer ties with Russia.
His ties with Russia predate the campaign: he sat with President Vladimir V. Putin at a 2015 event in Moscow, and was a key person in the transition team to deal with Russia.
Among the interactions that Mr. Mueller is investigating is a private meeting Mr. Flynn had with the Russian ambbadador and Jared Kushner, the president's son-in-law, during the presidential transition. Last year, it was revealed that the Trump campaign repeatedly tried to meet with Russian officials who promised compromising information about Clinton.
Mr. Flynn is considered loyal to Mr. Trump, but in recent weeks he has expressed serious concerns to his friends that prosecutors will bring charges against his son, Michael Flynn Jr., who was his father's chief of staff and was part of various funds. financial agreements involving Mr. Flynn that Mr. Mueller is examining.
The White House has said that neither Mr. Flynn nor other former aides have incriminating information about Mr. Trump. "He likes General Flynn personally, but he understands that they have their own way with the special lawyer," White House attorney Ty Cobb said in an interview last month with The New York Times. "I think I would be sad for them, as a friend and former colleague, if the process results in punishment or accusations, but to the extent that happens, that is beyond their control."
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