Storm Trump is brewing – and the whole world needs to brace itself

It is not a prediction, but it is a possibility - and a growing one. Barring a major upset, Donald Trump is on course to be the Republican nominee for US president. If he wins that contest, which begins in earnest in Iowa on 15 January, then polling in the handful of must-win, battleground states suggests he has a better than even chance of beating Joe Biden in November. Of course, much can change between now and then: once voters' minds are concentrated on the looming prospect of a Trump return, many might recoil. All the same, Americans need to…