Donald Trump has signalled a partial climb down from his proposed ban on Muslims entering the United States by suggesting it could be eased to allow Sadiq Khan, London’s newly-elected mayor, to visit.

The presumptive Republican presidential nominee’s comments came just hours after Mr Khan, who last week became the first Muslim mayor of a Western capital, said he planned to visit America before January in case Mr Trump was elected to the White House, an event that could see him barred from the country.