Mr. Flynn has pleaded guilty to lying to investigators about conversations he had with the Russian ambassador to the United States during the presidential transition.
WASHINGTON — Michael T. Flynn, President Trump’s first national security adviser, helped substantially with the special counsel’s investigation and should receive little to no prison time for lying to federal investigators, according to court documents filed on Tuesday.
Prosecutors for the special counsel, Robert S. Mueller III, described Mr. Flynn as a key cooperator who helped the Justice Department with several investigations, sitting for 19 interviews with Mr. Mueller’s office and other prosecutors and handing over documents and communications.
“His early cooperation was particularly valuable because he was one of the few people with long-term and firsthand insight” into the subject of Mr. Mueller’s investigation — Russia’s election interference and whether any Trump associates conspired, prosecutors wrote in a sentencing recommendation memorandum.
“The defendant deserves credit for accepting responsibility in a timely fashion and substantially assisting the government,” prosecutors wrote.
Mr. Flynn, who served briefly as the president’s national security adviser, is the only White House aide and the first person from the president’s inner circle to strike a cooperation deal with the special counsel’s office in exchange for a more lenient penalty.
The cases of the some other former Trump aides caught up in the special counsel investigation are also nearing resolution, marking an active week for Mr. Mueller’s inquiry into Russia’s election interference and whether any Trump associates conspired. By Friday, Mr. Mueller’s office is due to enumerate how it believes Paul Manafort, Mr. Trump’s former campaign chairman, violated a plea agreement and separately to outline the extent of cooperation by Michael D. Cohen, Mr. Trump’s longtime lawyer and fixer.
Another longtime Trump associate whom Mr. Mueller is scrutinizing, Roger J. Stone Jr., said on Tuesday that he had invoked his the Fifth Amendment rights in response to a request from Democratic investigators for the Senate Judiciary Committee to hand over documents and testimony relevant to their own Russia inquiry. Mr. Stone’s lawyer, Grant J. Smith, said the committee’s request was “overbroad” and stressed that Mr. Stone was “an innocent citizen who denounces secrecy.”
The letter was dated Monday, the same day that Mr. Trump praised Mr. Stone on Twitter for having the “guts” to stand up to Mr. Mueller. A lawyer for Mr. Stone said that the letter was sent before Mr. Trump’s tweet.