have you read the Mueller report? It clearly describes many instances of contacts between the campaign and Russian operatives. There is NO mention of collusion, except for the discussion that there is legally no such thing. Mueller stated that there wasn't enough evidence to rise to a case of criminal conspiracy. He also explains that this might not have been the case had it not been for refusals by some to be interviewed, claiming their 5th amendment rights by others, loss of some written or email documentation, and of individuals who were overseas and could not be forced to come to the US to be interviewed. Every US intelligence agency stated that the Russians DID interfere and that their intent was to aid the campaign of one candidate to the detriment of the other!