Try to keep up to date:
The Steele Dossier Is Increasingly Being Corroborated
http://washingtonmonthly.com/2017/03/08/the-steele-dossier-is-increasingly-being-corroborated/

whenever people in the Trump campaign have been confronted with facts that back up the allegations in the dossier, they have chosen to lie about it. In light of that, it is important to keep in mind the big picture of what those documents purport to say: that not only did Russia interfere in the 2016 election, but that the Trump campaign colluded with them to do so.

We now have a roadmap for the collusion as well:
http://nymag.com/daily/intelligencer/2017/07/now-we-have-a-roadmap-to-trump-campaigns-russia-collusion.html

drip, drip, drip