it's typical of trump to shift blame in advance. i suspect the deputy ag was set up. it's clear his memo wasn't the real reason for the comey firing. it was just the cover.
if rosenstein actually does resign, trump would be in real trouble.
of course, this story hasn't been corroborated yet. but there was something a bit fishy about the text, as some journalists pointed out. it wasn't a signed letter - it was a memo. so probably for internal use. it didn't actually say comey should be fired.
from the reporting, it sounds like trump requested the memo following a discussion between trump, the recused ag, and rosenstein.
so as usual, the whole white house communication is full of lies. these guys can't even fire someone without making stuff up.
of course, it is obvious what the truth is. trump fired comey because he didn't like the investigation he was running.