WASHINGTON, DC — Michael Flynn, former national security adviser to President Donald Trump, has cooperated substantially with special counsel Robert Mueller’s office — so much so that prosecutors recommended he serve no prison time.Prosecutors filed a sentencing memorandum Tuesday in Flynn’s case. He pleaded guilty last year to lying to the FBI about talks over sanctions with the Russian ambassador.

Flynn’s “record of military and public service” sets him apart “from every other person who has been charged” in the Mueller probe, prosecutors noted.

“His early cooperation was particularly valuable because he was one of the few people with long-term and firsthand insight” into the Mueller probe, the said.

Prosecutors added: “The defendant deserves credit for accepting responsibility in a timely fashion and substantially assisting the government.”

Flynn, a retired U.S. Army lieutenant general, is the first person in Trump’s orbit — and the only White House aide — to reach a cooperation deal with Mueller’s office in exchange for a lighter sentence, The New York Times reported. Tuesday’s filing provides the first glimpse into how well Flynn’s cooperated in the Russia probe. He participated in 19 interviews with prosecutors, though specifics as to what he said were withheld.

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Flynn started advising the Trump campaign in early 2016. Days after winning the election, Trump announced Flynn would serve as his national security adviser. But during the transition period, Flynn talked with Sergey Kislyak, then Russian ambassador to the United States, about a planned U.N. Security Council vote on denouncing Israeli settlements. The duo also talked about Obama-era sanctions against Russia over election meddling.

Shortly after Trump’s inauguration, Flynn lied to FBI investigators about those discussions.

Under his plea deal, Flynn said some members of Trump’s inner circle — including Jared Kushner, his son-in-law and White House aide — were involved in or directing his actions.

Kushner told Flynn to contact several countries, including Russia, about the U.N. Security Council vote, court documents allege, and it was during those talks that Flynn asked Russia to delay or vote against the resolution. The Kremlin eventually rejected that request.

Flynn resigned Feb. 13, 2017, following reports that Obama officials had warned the Trump White House that Flynn had lied to the FBI.

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The Associated Press contributed to this report.

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