MICHAEL FLYNN
Trump's former national security adviser, a retired Army lieutenant general who had led the Defense Intelligence Agency, was the first White House official charged in Mueller's probe. His plea last December to one count of lying to the FBI requires Flynn to cooperate with prosecutors.
In August, the special counsel's office said Flynn was still not ready to be sentenced, a sign that he is still cooperating.
Flynn was a national security surrogate during the later parts of the campaign. He was charged with lying about conversations with a Russian ambassador during the transition.
GEORGE PAPADOPOULOS
George Papadopoulos, who served as a foreign policy adviser to the Trump campaign, was sentenced in September to 14 days in prison for lying to the FBI about his contacts with Russian intermediaries.
Papadopoulos was the first campaign aide sentenced in Mueller's investigation, and he was also the person who triggered the initial Russia investigation two years ago. Memos written by House Republicans and Democrats, now declassified, show that information about Papadopoulos' contacts with Russian intermediaries triggered the FBI's counterintelligence investigation in July 2016 into potential coordination between Russia and the Trump campaign. That probe was later taken over by Mueller.
The White House has said that Papadopoulos was a low-level volunteer on the campaign.
At his sentencing hearing, Papadopoulos told the judge that he was "deeply embarrassed and ashamed" for lying. Prosecutor Andrew Goldstein said Papadopoulos' cooperation "didn't come close to the standard of substantial assistance."
Papadopoulos was released from a federal prison in Wisconsin last week.
