When Colombia’s leftwing presidential candidate, Iván Cepeda, conceded defeat last week, he did so with notable grace. His ally, the outgoing president, Gustavo Petro, was much less composed. In a series of social media posts, Mr Petro argued that Donald Trump had interfered in the contest that brought the far-right lawyer Abelardo de la Espriella to power. The claim should not be taken as proof of a stolen election. But nor should it be dismissed as paranoia.

Mr Trump did publicly endorse Mr de la Espriella. His razor-thin win was in contrast to the scale of his alarmingly rightwing programme. He promises mega-prisons, a war on rebels, a shrunken state, renewed oil exploration, fracking and corporate tax cuts. This won’t be easy. Mr Petro’s Pacto Histórico is the largest party in the country’s congress. Unsurprisingly, Mr de la Espriella wants to govern through executive........

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