Trump is right to point out that Obama’s global antics have been ham-fisted. The continuing continuing chaos in the Middle East may be an easy target, but he has persistently opposed these interventions. Obama’s fascination with the drone as a weapon of aggression, his failed “reset” with Russia, the decline in relations with China, and the clumsy remarks about Brexit all illustrated an ineptitude as self-appointed global policeman.

Last week American jets massacred 73 civilians, including 50 women and children, in the Syrian village of Manbij. Imagine if Isis had done this. Obama’s wars remain unresolved and immoral.

A jolt of realpolitik from an isolationist Republican would be no bad thing. Of course, Bush too was vigorously isolationist in his pre-9/11 mode in 2000, but the days when the world’s collective security hung on a Washington heartbeat are over. Behind the bombast, a period of transatlantic withdrawal and reflection is in order.