Donald Trump v Sadiq Khan: A war of words dating back years - BBC News
The row between the US president and London's mayor dates back to 2016. Why did it all start?
During President Donald Trump's state visit to the UK, the US leader had strong words for the Mayor of London, Sadiq Khan.

But, the political grudge match between the two started before Air Force One landed in the UK.

BBC London's Karl Mercer explains the long-running feud between the two men.