Arlene Foster, the DUP leader, is keen to avoid a hard border with Ireland and has spoken against a "hard Brexit."

She has said: “No-one wants to see a ‘hard’ Brexit, what we want to see is a workable plan to leave the European Union, and that’s what the national vote was about – therefore we need to get on with that.

“However, we need to do it in a way that respects the specific circumstances of Northern Ireland, and, of course, our shared history and geography with the Republic of Ireland.