I am not sure how the Comey memos can be helpful for Trump. Wouldn’t Comey have just written whatever truth he wanted?
Comey has represented certain things under oath and to the public. His memos may contradict. Conclusion: Comey is a lying hack.
That's one way.
Another way - absence of evidence of Russian collusion or obstruction.
Comey says to Trump, "I don't leak." LOL.