How did Rob Goldstone, a British tabloid hack turned P.R. guru get caught up in this situation with the president’s son?
According to Goldstone’s own story, he moved from local journalism to work for Rupert Murdoch’s best-selling British newspaper The Sun before turning to public relations for pop stars.  
This career path happens to be ideal training in what Russian intelligence agencies call “kompromat,” (compromising material), because smear campaigns based on "opposition research" are a core business strategy of Britain’s popular press.
At first glance Rob Goldstone looks like a bit player in this story, but he is in fact an expert in "The New Sleazocracy."
Goldstone's presence should tell you that this had nothing to do with adoptions.