FBI agents’ concerns became more pronounced when a highly-classified piece of evidence -- an intercepted conversation between Flynn and Russian ambassador Sergey Kislyak -- suddenly leaked to the news media and prompted Flynn’s resignation as Trump’s top security adviser.
“The Flynn leaks were nothing short of political,” one FBI employee said, noting the specific contents of the conversation were known by only a handful of government officials when they leaked. “The leaks appeared to be targeted to take Flynn out.”
http://circa.com/politics/accountability/did-the-fbi-retaliate-against-michael-flynn-by-launching-russia-probe