Brexit: It wasn’t a mistake. DUP leader defends campaign to leave EU.

It wasn't a mistake. That's the claim from First Minister Arlene Foster over the decision to campaign for the UK to leave the European Union. letter sent to the Prime Minister, signed by Mrs Foster and Martin McGuinness, puts forward a wish list for what Northern Ireland needs post-Brexit negotiations. But political opponents of the DUP are calling the move a u turn.