Given how much evidence could be classified the problem here is a lot of it is going to rely on how much you trust the National Security Complex, and given that

Given how much evidence could be classified the problem here is a lot of it is going to rely on how much you trust the National Security Complex, and given that the political party affected is the one whose base is more suspicious of the Nat Sec that isn't necessarily an easy case. I'm inclined to trust them in this case since it goes along with other evidence that we've seen, it makes sense with how Putin does things, and I don't see why they would have a reason to pick a fight with Trump right now by making something up.