It’s a lie, anyway. It is part of Comey’s plan to entrap Trump and get a Special Counsel appointed. McCabe is one of the players in that plan.
Trump told Comey he better hope that there is no recording of that meeting. I bet there is one, but not one made by Trump. Maybe NSA or CIA, but Trump knew about it.
Unless McCabe was a witness to the conversation
any retelling of it by Comey is meaningless.
I am sure President Trump secured a transcript of that conversation. However, he is reluctant to reveal it because it would compromise the secret nature of the access he has.
This also reveals the nature of how President Trump communicates. He speaks with words that can be used two ways. The meaning is with the context. Eliminate the context and you can have him say anything you want him to say.
His enemies are counting on that.