If someone wanted to waste a bunch of time, they could search Obama’s speeches for the phrase “by the book”. I’ll bet he never used it publicly and this is just how the lying liar Susan Rice decided to put it in her CYA memo.
The whole premise of which is ridiculous, not only because it is self-serving but because if she wrote this to be used as evidence, she should have known the only reason it would ever be seen is if they whole story came out and by then we’d know they were listening to Gen. Flynn’s phone calls and already knew what he was saying to Kisliyak. Loss of logical reasoning power is a symptom of extreme stress and fear.
Obama was spying on the Trump campaign/transition with the knowledge of the GOPe (Gang of 8, etc.) and without warrants. I’d bet my house this goes way beyond Flynn.