US President Trump's pardon of Flynn, which could be the first of several after his loss of the 2020 presidential election to Democrat Joe Biden, drew condemnation from Democrats and other critics.
The move came just days before Stone was to begin serving a 40-month prison sentence for lying to the US Congress, witness-tampering and obstructing the House investigation into whether Trump's campaign colluded with Russia to win the 2016 election.
A divided federal appeals court ordered the dismissal of the criminal case against President Donald Trump's former national security adviser Michael Flynn.
Trump's newly confirmed spy chief, John Ratcliffe, declassified the transcript of the conversation between Flynn and Russian ambassador to Washington Sergey Kislyak and released them to Congress in one of his first official actions in his new role.
The department said in a filing that Flynn's December 2017 guilty plea for lying to the FBI over his Russia contacts was not significant to the case, and said the FBI's original probe of him had no "legitimate investigative basis."
Bijan Kian, a former associate of Michael Flynn, was accused of working for the Turkish government but the prosecutors were unable to bring evidence.
With his name officially cleared over accusations of collusion with Russia during the 2016 elections, the US president can use his exoneration for political advantage, but he still has hurdles to clear.
"We are going to initiate investigations into abuses of power, into corruption and into obstruction of justice," the chairman of the House committee, Rep. Jerrold Nadler, D-N.Y. said. "We will do everything we can to get that evidence."
Revelations of the Trump administration’s attempt to transfer nuclear technology to Saudi Arabia are part of a broader pattern.
Senator Lindsey Graham was reacting to former FBI deputy director Andrew McCabe's comments that US President Trump might have committed a crime in handling the Russia probe and top officials discussed invoking the 25th Amendment.
Michael Flynn pleaded guilty in December 2017 to lying to FBI agents about his conversations with Sergei Kislyak, Russia's ambassador in Washington at the time.
Special Counsel Robert Mueller's office says Donald Trump's former national security advisor Michael Flynn provided substantial assistance in its investigation into Russia's alleged interference in the 2016 US presidential election.
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