They used the Logan Act, a law that criminalizes negotiation by unauthorized American citizens with foreign governments, against an authorized incoming National Security Adviser of a duly elected president. You can hardly call this a peaceful transition of power.
The transcript is out. Flynn asked Kislyak to not retaliate to Obama expelling Russian diplomats by expelling American diplomats in turn in order to keep communication channels open so both countries can more effectively deal with ISIS and stabilize the Middle East.
This was the big “collusion”.
Putin Says Russia Won’t Expel Diplomats In Response To U.S. Sanctions
Russian Foreign Minister Sergei Lavrov went on state TV Friday to announce plans for a tit-for-tat response to U.S. sanctions on Russia. But President Vladimir Putin says it’s not happening.