The charges were brought by Special Counsel Robert Mueller, as part of his inquiry into alleged Russian meddling in the 2016 US election.
Michael Flynn is the most senior member of the administration to be indicted.
He also revealed he was co-operating with Robert Mueller’s inquiry.
Significantly, a statement made by Michael Flynn to prosecutors appears to implicate a more senior, though unnamed, Trump team official – indicating the direction in which Robert Mueller’s investigation may be heading.
Media outlets, including NBC News, Bloomberg and the Washington Post, said the senior official is Jared Kushner – Donald Trump’s adviser and son-in-law.
Appearing in a federal court in Washington DC, Michael Flynn admitted to one count of knowingly making “false, fictitious and fraudulent statements”.
According to an AFP reporter in court, the judge accepted Michael Flynn’s guilty plea and said he would not face trial.
Michael Flynn then issued a statement in which he said: “I recognize that the actions I acknowledged in court today were wrong and, through my faith in God, I am working to set things right.”
He said his plea and co-operation deal “reflect a decision I made in the best interests of my family and of our country”.
Michael Flynn, a retired Army lieutenant-general, is unlikely to serve more than six months in prison.
The White House issued a statement saying that “nothing about the guilty plea or the charge implicates anyone other than Mr. Flynn”. A presidential appearance in front of reporters was then canceled.
As Michael Flynn was escorted from court by FBI agents, a handful of protesters shouted “criminal” and “lock him up”, echoing a chant he led against Hillary Clinton during the GOP convention in 2016.
Michael Flynn was forced to resign 23 days into his job in February, a month after he was questioned by the FBI for misleading the White House about meeting then Russian Ambassador Sergei Kislyak during the transition period, before Donald Trump took office.
Then, just over a week ago, media said his legal team had told the president’s lawyers they could no longer discuss the case, prompting suggestions that he had begun co-operating with prosecutors.
It is not clear why he did not tell the truth to investigators. However, it is illegal for a private US citizen, as Michael Flynn was during the transition, to conduct foreign affairs without the permission or involvement of the US government.
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