In his new report on the Trump-Russia affair, special counsel Robert Mueller revealed that former national security adviser Michael Flynn was already under FBI investigation when he spoke with the Russian ambassador during the transition before President Trump took office. Flynn's conversations with Ambassador Sergey Kislyak were previously thought, by the public at least, to be the reason the FBI became suspicious about, and began investigating, Flynn's conduct.
Flynn was never charged with any crime relating to now-debunked allegations the Trump campaign conspired or coordinated with Russia to fix the 2016 election. Flynn pleaded guilty to lying to the FBI in a Jan. 24, 2017 interview during which he was questioned about the Kislyak calls. Specifically, Flynn denied that he and Kislyak discussed Russia's reaction to new U.S. sanctions over election interference, when a transcript of the conversation, based on a secret wiretap, showed that they had.