It is the meeting everyone is talking about: Donald Trump Junior, his brother-in-law and the chairman of Donald Trump Senior's election campaign talking to a Russian lawyer who had allegedly offered damaging material about Hillary Clinton.
It was an encounter proposed by a British music publicist and allegedly arranged by an Azerbaijani-Russian businessman, whose pop star son once featured Mr Trump Sr in a music video.
Feeling lost? Here are the key players explained.
Donald Trump Jr
Donald Trump Jr speaks at the 2016 Republican National Convention in Cleveland on 19 July 2016Image copyrightREUTERS
The centre piece of it all is Donald Trump's eldest son from his first marriage to Ivana, who is now executive vice-president of the Trump Organization.
Here is how it unfolded: he received an email from British music publicist Rob Goldstone promising documents from Russia that would incriminate Democratic candidate Hillary Clinton.
The meeting was allegedly arranged by Azerbaijani-Russian billionaire Aras Agalarov, whose son Emin is a pop star who was managed for a time by Mr Goldstone (more on all of them later).
One email from Mr Goldstone said the information they had been promised was "obviously very high-level and sensitive information but is part of Russia and its government's support for Mr Trump".
Mr Trump Jr's response to it was: "If it's what you say I love it".
The meeting took place in June 2016 at Trump Tower in New York. When news of it emerged, he denied that the meeting had anything to do with the campaign (we explain what he said below).
He then told Fox News Ms Veselnitskaya had provided them with nothing of use and it had only lasted 20 minutes.
