Well, it's obvious he didn't keep any memos on his meetings with McCabe, or they wouldn't be fighting over who lied more about the leaks.
Interesting. Selective memo keeping?
Maybe it is a CYA game that they play. The down side, of course, is that those memos can be used against the person who wrote them or they might implicate fellow cohorts.
So, they probably only keep notes for certain people — like recording conversations. Maybe notes are legal and recordings are not?