Why did Donald Trump Jr turn up in a tiny British enclave looking for money?

Meetings in Gibraltar are the latest twist in worldwide campaign that is enriching the US president's family

One Friday in November, armed police blocked off the road that runs beside Gibraltar's medieval city walls to clear the way for a convoy of blacked-out BMWs. The vehicles pulled up at the offices of Hassans, a law firm.

The British enclave in the Mediterranean is a hub for the international ultra-rich, and Hassans counts many of them as clients. But few as highly placed as that day's visitor: Donald Trump Jr, the man running the family business while his father is in the White House.