Comey alleged in the memos that he felt pressured by Trump to drop the investigation into Flynn. The media used this to accuse Trump of “obstruction” into the Flynn investigation, and question the independence of the investigation, calling for the special counsel. Sessions had already recused himself from this matter, so Rat Rosenstein had all the excuse he needed to appoint Mueller.
Thank you Boogieman. Everyone says it’s out there but nobody except you was able to respond with any info.
so the memo contained comey’s recollections of being pressured to drop the Flynn investigation.
... and supposedly that kicked it off. IMO they would have used anything to kick it off.