So this is now a he said, he said in regard to this conversation between Comey and Trump where Trump allegedly says he "hopes" that Comey can end the investigation of Flynn. I find it amusing to see conservatives arguing inconsistent positions. First, that Comey is lying. Second, that Trump couldn't have been ordering Comey to do anything because he said "I hope." Evidently it hasn't occurred to them that if Comey made the whole thing up, it isn't likely he would have had Trump framing this in a qualified way. A made up version meant to incriminate Trump would have had Trump literally brow beating Comey to drop the investigation. Meaning that, regardless of how you interpret Comey's version from the standpoint of obstruction, Trump is the clearly the one lying here.
I think they need to bring back Andrew McCabe to testify. He was deputy FBI Director at the time Comey had this conversation, meaning he would have been one of the people Comey spoke to about this back in February when it happened, since Comey says he shared this with "FBI leadership."