Deus ex machina was the ancient Greek theatrical convention of resolving the unresolvable by crane-lifting a god on to the stage to make everything better again through divine fiat. Right now, a bit of deus ex machina sounds pretty sweet. Many people hoped special counsel Robert Mueller’s Russia probe would play that role in the US. Its conclusions would be so damning as to sweep away the knotty problem of Donald Trump without the grinding task of finding support for a different president in 2020. But it was never likely that congressional mathematics would allow impeachment, nor even that Mueller’s report (assuming we ever get to see it) would contain anything to sway anyone either way. We all, surely, know what we think of Trump by now. In the UK, some Remainers have been hoping the divine plot twist would be supplied by a record-breaking petition. Almost 6-million people have demanded that the UK revoke Article 50 and walk out of the Brexit tragedy before the final act. On Tuesda...

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