Image copyright Getty Images Image caption Flynn and Trump had a strained relationship
Donald Trump’s former national security adviser has said he will “cooperate fully” with an investigation into Russia’s interference in the 2016 US election.
Michael Flynn said he was confident that he would be vindicated in light of the “disturbing evidence” in the investigation.
He also blasted claims of wrongdoing, telling his attorney to file the necessary paperwork for immunity.
The move was immediately condemned by Democratic lawmakers.
Mr Flynn was sentenced last month to two years in prison after pleading guilty to lying to the FBI about his contacts with Russia.
Image copyright Reuters Image caption Mr Flynn is seen with Trump and the Russian ambassador at the presidential inauguration in January 2017
It followed an investigation by Robert Mueller into Mr Trump’s presidential campaign team’s dealings with Moscow during the campaign.
With an assistance agreement to be sought, Mr Flynn is prepared to discuss “certain aspects” of the investigation as well as testifying in future cases, his lawyer Robert Kelner said in a court filing on Saturday.
“We are hopeful that, as part of the negotiations that are under way, those details will be made available to the special counsel’s office,” Mr Kelner said.
Despite the Trump administration’s repeated claims that Mr Mueller is “stuck in a loop,” Mr Flynn’s plans to seek immunity “is nothing new” and is a central part of the special counsel’s probe into the election meddling, Democratic Senator Mark Warner said.
Mr Warner is the vice chairman of the Senate Select Committee on Intelligence, a congressional oversight body tasked with examining Russian interference in the election, the Kremlin’s connections to the Trump campaign and Russian-supported hacking.
“It’s highly damaging to the credibility of the entire investigation, if they are basically asking for immunity,” Democratic Senator Ron Wyden, another member of the intelligence committee, told reporters.
He said granting immunity to Mr Flynn would “create grave conflicts of interest”.
Former CIA Director John Brennan has said that it would be “an outrageous abuse of prosecutorial discretion” to give Mr Flynn immunity.
Mr Brennan, who served under President Barack Obama, also warned that the US could be dragged into another war.
“It’s a grave mistake for Trump and his close associates to allow Robert Mueller and his team to undermine the legitimacy of our government in this way,” he wrote in an op-ed for the New York Times.
House Oversight Committee Chairman Trey Gowdy said Trump’s son-in-law and senior adviser Jared Kushner should also seek immunity for his testimony.
“What Michael Flynn said at sentencing hearing was that he would be willing to testify even if Mueller didn’t give him immunity,” Mr Gowdy said on Twitter.
“The next move in this saga will be made by the Office of Special Counsel.”