[generally]

I thought it was already known that there were at least 4.

Gates
Manafort
Page
Papadopoulos

(In fact I thought you posted about the 4)

[Cboldt]

The question is how many of those four (if any) are FBI plants in the Trump campaign.

And Posobiec appears to be opening up "informatnt" to include people outside the Trump campaign (Halper).