Special counsel Robert Mueller filed a sentencing memo Tuesday night suggesting that Michael Flynn has given the government "substantial assistance", and it recommends that Flynn serve no time for making a false statement to the Federal Bureau of Investigation.
The filing is heavily redacted, continuing to shroud in secrecy the details of what Flynn told Mueller's team about his interactions with Trump and other top officials.
Thirty-three people and three companies have been charged in the probe, including Cohen, Trump's former lawyer who last week pleaded guilty to lying to Congress when he insisted that Trump was pursuing plans to build a Trump Tower in Moscow in 2016.
The filing by special counsel Robert Mueller provides the first details of Flynn's assistance in the Russian Federation investigation, including that he participated in 19 interviews with prosecutors.
The special counsel faces a Tuesday deadline in Michael Flynn's case to file a memorandum recommending a sentence and providing a federal judge with a description of how valuable the retired U.S. Army lieutenant general has been to the probe.
The president again accused Cohen of lying about making false statements to lawmakers so he could get a reduced sentence. The sentencing guidelines for Flynn's offense suggest 0 to 6 months of incarceration.More news: 'Enough evidence to charge Benjamin Netanyahu': Israeli police
His revelation in court that Trump and his family were kept informed about contacts over building a Trump Tower in Moscow has ratcheted up the pressure from the investigation on the U.S. president. Days earlier Mueller's team scrapped a plea deal with Paul Manafort, Trump's former campaign chairman, after he allegedly continued lying to investigators even after promising to cooperate.
Mr Flynn had been a fervent supporter of Mr Trump during the election campaign.
The criminal charges included five counts of tax evasion, one count of making false statements to a financial institution, one count of willfully causing an unlawful corporate contribution, and one count of making an excessive campaign contribution at the request of a candidate. One knowledgeable source said Flynn's cooperation largely took place immediately following his December 2017 court appearance. Both of those matters had been previously referenced in the court filings and hearings for Flynn's plea past year. Stone told ABC News on Sunday he would not testify against Trump and has not discussed a pardon with the president.
Sentencing memos filed by Mueller in other prosecutions so far, including former Trump campaign adviser George Papadopoulos, have contained new information about wrongdoing and cooperation by the subjects.