I don't think it is likely he was involved in the early stages of the dossier. I haven't seen any reports that suggest McCain knew about it before the election, but it highly possible since the detestable Harry Reid was squawking about the dossier at the end of October. Since the dems are in the minority, they needed some never Trumper Rinos like McCain to thwart Trump. Senile old McCain was the perfect conduit to make it look bi-partisan.
The dam will burst when McCain hits the dirt not before
Noted that graham began splitting away from McCain and more pro trump five or so months ago.
There was a post yesterday wherein the fbi was quoted as saying they still believe much of what was in the dossier was true! As in credulous as that sounds they must say that or admit it was a set up. They are planning on using the defense they gave Clinton in modified form: there was no bad intent for what they did. So we need a buster prosecutor to turn one of these bums to spill the beans.
Now in paraphrase if a truth nugget of great import arises and no one cares to see it does anything ever happen?