There used to be a trick question on the Virginia bar exam: Is there an absolute defense against a charge of attempted statutory rape?
The answer is, yes, ignorance of the target's age is an absolute defense, although that is not, in Virginia, a defense against a charge of statutory rape.
(Off my topic here, but curiously pertinent to current concerns is that attempted statutory rape is the charge being made against Roy Moore, the Alabama moralist. He is vehemently suspect but that is not a charge that prosecutors ever bring.)
So, did the Trump campaign collude with the Russians to turn the 2016 election?
Trump says no. The evidence is not public that it did so successfully.
On the other hand, it is beyond dispute that the Trump campaign attempted collusion.