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Lt. Gen. Michael Flynn arrives for a meeting with US President-elect Donald Trump at Trump Tower December 12, 2016 in New York.
Lt. Gen. Michael Flynn arrives for a meeting with US President-elect Donald Trump at Trump Tower December 12, 2016 in New York.

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    Source: 'Knives out' for Flynn

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Source: 'Knives out' for Flynn

The President's national security adviser is facing a crisis over a phone call that may have tipped off the Russians on lifting sanctions. CNN's Sara Murray reports.

Source: 'Knives out' for Flynn

The President's national security adviser is facing a crisis over a phone call that may have tipped off the Russians on lifting sanctions. CNN's Sara Murray reports.