Who would venture to forecast with any confidence that the UK will still be the UK in its current composition in the next 20 years?
Mr Corbyn has angered Labour MPs and supporters by arguing Brexit cannot be stopped – and by going on to reject the growing calls for a fresh public vote.
But Ms Thornberry said: “If we don’t have a general election then, yes, of course all the options remain on the table and we would campaign for there to be a people’s vote – but there are several stages before we get that.”
Warning Britain “stands on the brink of the greatest crisis since the Second World War”, he became the ninth Conservative MP to demand she “give the public the final say”.
The call came after the number of signatures on The Independent’s petition for a Final Say referendum cleared one million in just over three months.