The Daily Paul has details here.
Apparently Kokesh made comments in support of the Paul campaign, which then put the show into legal jeopardy.
Because RT is a foreign news outlet, it can’t have shows that are actively supporting a political campaign because it would create the appearance of a foreign government supporting a US political campaign.
It really is a great tragedy that was caused by Kokesh simply not having a full understanding of all the millions of lines of US campaign laws. Unfortunately this may turn into a massive legal headache for RT and the Paul campaign.
A very unfortunate event caused by our statist system of coercively funded government.