The first sentence is factually untrue. He may have known that Trump was considering firing Comey, but the firing actually happened after, and was, at least partially, based on the memo. The Mueller appointment was purportedly to continue Comey’s Russia investigation, but the scope was intentionally open ended and the obstruction angle was telegraphed right from the get go ...
Interesting thing to remember, how were they so certain of what Trump said to the Russians? Lol! This was before Trump cleared the WH and clamped down on the leaking ...