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Former Trump national security adviser Michael Flynn, center, arrives at federal court in Washington, Friday, Dec. 1, 2017. Court documents show Flynn, an early and vocal supporter on the campaign trail of President Donald Trump whose business dealings and foreign interactions made him a central focus of Mueller's investigation, will admit to lying about his conversations with Russia's ambassador to the United States during the transition period before Trump's inauguration.  (AP Photo/Susan Walsh)
Former Trump national security adviser Michael Flynn, center, arrives at federal court in Washington, Friday, Dec. 1, 2017. Court documents show Flynn, an early and vocal supporter on the campaign trail of President Donald Trump whose business dealings and foreign interactions made him a central focus of Mueller's investigation, will admit to lying about his conversations with Russia's ambassador to the United States during the transition period before Trump's inauguration.  (AP Photo/Susan Walsh)

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    Flynn says he's cooperating with Mueller

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Flynn says he's cooperating with Mueller

Former Trump national security adviser Michael Flynn pleaded guilty to lying to the FBI about conversations with Russia's ambassador and disclosed that he is cooperating with the special counsel's office.

Flynn says he's cooperating with Mueller

Former Trump national security adviser Michael Flynn pleaded guilty to lying to the FBI about conversations with Russia's ambassador and disclosed that he is cooperating with the special counsel's office.