[jjotto]

The first date that appears in the Dossier itself was June 2016. Mother Jones made sure the FBI was aware of it in July 2016.

http://www.washingtonexaminer.com/byron-york-did-dossier-trigger-the-trump-russia-probe/article/2640470

...So the timeline is: The first dossier report was June 20, Steele approached the FBI near the start of July, and the FBI began its investigation in late July...

[EVO X]

Thanks for the link. Not sure how I missed that one. If despicable Harry Reid had it on 27 Aug, then it is likely everyone knew about it by then.