Britain's ambassador to the US said Donald Trump abandoned the Iran nuclear deal in an "act of diplomatic vandalism" because it was agreed by his predecessor Barack Obama, according to the latest leaked cables.
The May 2018 memo was said to have been written by Sir Kim Darroch after a visit to the US by Boris Johnson, then foreign secretary and now frontrunner for the Tory leadership, who was making a final attempt to keep America in the deal.
The Iran accord, which is still backed by Britain, France and Germany, eased sanctions in return for cuts to Iran's nuclear programme.
It is the second set of leaked emails published by The Mail On Sunday - last weekend they revealed that Sir Kim had described Mr Trump's administration as "inept" and "dysfunctional", a revelation that eventually led to the ambassador's resignation.
The Met Police Counter Terrorism Command, which is responsible for investigating allegations of criminal breaches of the Official Secrets Act is investigating the source of the leaks.
