Mueller on Friday also released memos written by the FBI agents, and emphasized that when Flynn lied to them on January 24, 2017, about the substance of his policy conversations with then-Russian Ambassador Sergey Kislyak, he had already lied to several members of Trump’s team and was “committed to his false story” that he and Kislyak did not discuss sanctions.

The FBI memos make clear that top Justice Department and bureau officials knew that Flynn’s public story about his calls with Kislyak differed from what he actually said to the ambassador on the phone during the presidential transition — and the agents who spoke with him at the White House about it were prepared to confront him.

…It’s widely believed that at that time, the FBI was aware of the conversations Flynn had with Kislyak because the intelligence community had listened in on the foreign diplomat’s calls. On the calls, Flynn discussed Russian sanctions and a UN Security Council vote with Kislyak.

Michael Flynn’s criticism of FBI interview slammed by special counsel – CNNPolitics

hmmm