The primordial ooze for all things Russia began in spring 2016 when the Clinton campaign and Democratic National Committee, through a company called Fusion GPS, hired former MI6 intelligence agent Christopher Steele to compile a report (“the dossier”) on whatever ties to Russia he could find for Donald Trump.
https://wemeantwell.com/blog/2019/03/30/russiagate-why-did-this-ever-start-in-the-first-place/