I don’t see how this is anything other than straight up, original intent treason:

Six of the 18 [newly disclosed] contacts were between Sergey Kislyak, Russia’s ambassador to the U.S., and campaign officials, including former national security adviser Michael Flynn. Among other things, they spoke about “establishing a back channel for communication between Trump and Russian President Vladimir Putin that could bypass the U.S. national security bureaucracy, which both sides considered hostile to improved relations,” Reuters heard from four current U.S. officials.

The Trump Team Reportedly Had 18 Contacts With Russia During the Campaign