The DUP has warned it will bring down Theresa May's Government if Northern Ireland is forced to stay in the Single Market or Customs Union after Brexit.

Nigel Dodds, the leader of the Democratic Unionist Party at Westminster, said his party would vote against the Government if any of its "red lines" on Brexit were crossed.

It comes as Britain and the EU are deadlocked over how to ensure that there is no hard border between Ireland and Northern Ireland after Brexit.

Mr Dodds told the Conservative home website: “If, as a result of the Brexit negotiations for instance, there was to be any suggestion that Northern Ireland would be treated differently in a way, for instance that we were part of a customs union and a single market and the rest of the UK wasn’t ... for us that would be a red line, which we would vote against the Government.

“You might as well have a Corbyn government pursuing openly its anti-Unionist policies as have a Conservative Government doing it by a different means.”