US Special Counsel Robert Mueller's office will make a sentencing recommendation for former national security adviser Michael Flynn on Tuesday, in a court filing that is expected to shed light on the extent of Flynn's cooperation in the Russian Federation probe.
Flynn "provided firsthand information about the content and context of the interactions between the transition team and Russian government officials", the Special Counsel wrote.
To date, there have been scant details from Mueller's team about the extent of Flynn's cooperation, including how many times he was interviewed, what he disclosed and whether he fully cooperated to their satisfaction.
Cohen pleaded guilty last week to lying to Congress about negotiations he had on Trump's behalf for a real estate deal in Moscow. It indicated that Flynn was also aiding one or more other federal criminal investigations related to the Trump campaign, but not being led by Mueller.
Trump cited Stone's pledge to never testify against him.
He will be sentenced in the US District Court for the District of Columbia on December 18.
Trump has repeatedly lamented how Flynn's life has been destroyed by the special counsel's probe.
Mr Flynn has admitted one count of lying to the Federal Bureau of Investigation.
The sentencing of Flynn, a retired U.S. army lieutenant general, was delayed four times after Mueller repeatedly said he needed more time "due to the status of the investigation" - an indication that he wanted to protect sensitive information.
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In the year since he was charged, Flynn has been a recluse, and mystery surrounds the scope of his cooperation with Mueller. According to the filing, Flynn has been cooperating in "several ongoing investigations".
Around that time, Trump asked then-FBI Director James Comey to let the Flynn investigation go, Comey has said.
In September, Manafort (who served as Trump's campaign manager before Kellyanne Conway joined the campaign) agreed to a plea deal with Mueller in order to avoid a second trial (the summer trial had resulted in eight convictions for crimes ranging from tax fraud to bank fraud).
In a sentencing memo released on Tuesday, Mueller touted Flynn's 33-year military career, his time at the helm of the Defense Intelligence Agency, and his extensive government cooperation as mitigating factors in the case.
He added that Cohen "could have fought the government and continued to hold to the party line, positioning himself perhaps for a pardon or clemency, but, instead - for himself, his family, and his country - he took personal responsibility for his own wrongdoing and contributed, and is prepared to continue to contribute, to an investigation that he views as thoroughly legitimate and vital".
He is the only member of the Trump administration so far to plead guilty as a result of the investigation.
Flynn pleaded guilty in December 2017 to lying about his conversations with Russian ambassador Sergey Kislyak in the weeks before President Donald Trump took office. "I don't think it rises to the level of obstruction yet, but it certainly would cause people who are conducting the investigation to start asking questions about whether or not the target has reached out to them". "The fact it's done out in the open is no defence", said Neal Katyal, a veteran constitutional lawyer and former acting solicitor general of the Department of Justice.
According to court papers, in mid-December 2016, Mr Kushner directed Flynn to reach out to several countries, including Russian Federation, about a UN Security Council resolution regarding Israeli settlements. That conversation took place the day the Obama Administration announced it was imposing sanctions on Russian Federation for attempting to interfere in the election, raising questions about whether he violated the Logan Act, which bars private citizens from negotiating with foreign governments about official disputes. He was forced to resign in February 2017.