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NEW YORK, NY - DECEMBER 12: Retired Lt. Gen. Michael Flynn, President-elect Donald Trump's choice for National Security Advisor, waits for an elevator in the lobby at Trump Tower, December 12, 2016 in New York City. President-elect Donald Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration. (Photo by Drew Angerer/Getty Images)
NEW YORK, NY - DECEMBER 12: Retired Lt. Gen. Michael Flynn, President-elect Donald Trump's choice for National Security Advisor, waits for an elevator in the lobby at Trump Tower, December 12, 2016 in New York City. President-elect Donald Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration. (Photo by Drew Angerer/Getty Images)

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    Defense Department opens Flynn investigation

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Defense Department opens Flynn investigation

Former national security adviser Michael Flynn was warned by the Defense Intelligence Agency in 2014 against accepting foreign payments as he entered retirement, according to new documents obtained by the House oversight committee. CNN's Manu Raju reports.

Defense Department opens Flynn investigation

Former national security adviser Michael Flynn was warned by the Defense Intelligence Agency in 2014 against accepting foreign payments as he entered retirement, according to new documents obtained by the House oversight committee. CNN's Manu Raju reports.