When someone asks "Have you spoken with anyone in the Trump administration about the Russia investigation", and Sessions responds with a non answer such as "I can answer that question because it's part of a private conversation blah blah", that basically means:
YES.
Otherwise if the answer was NO, he would have said "No". So a non-answer makes it very clear what the real answer is.
Same with Comey. When he says he'd rather discuss whether or not Trump campaign members colluded with Russians in a closed setting, that means "yes, there was collusion".
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