The story of the Trump dossier: secret sources, an airport rendezvous, and John McCain (the guardian)

What began as opposition research during the Republican primary slowly grew from a covert investigation into an extraordinary but unverified global story ...
https://www.theguardian.com/us-news/2017/jan/11/trump-russia-report-opposition-research-john-mccain?CMP=oth_b-aplnews_d-1