Democratic Unionist leader Arlene Foster has insisted any deal agreed as the UK prepares to leave the EU must meet her party’s red line.

Speaking after her meeting with Michel Barnier in Brussels on Tuesday, Mrs. Foster said her party needs to see the legal text of any agreement to check it against its red line, which rules out any extra barriers to trade between Northern Ireland and the rest of the UK.

The UK Government has promised to set out further proposals on the “backstop” arrangement aimed at avoiding a hard border with Ireland, with speculation that it could involve regulatory checks on goods travelling between Britain and Northern Ireland.

The EU’s proposed backstop would see Northern Ireland effectively remain in the customs union and single market while the rest of the UK shifts away from Brussels’ rules, something the Prime Minister has already said would be unacceptable.

Mrs. Foster, whose 10 MPs play a critical role in propping up Theresa May’s administration in Westminster, said she wants to see a deal struck “that works for everyone”, while respecting the result of the referendum.

“It is vital that the European Union understands the sensitivities surrounding Northern Ireland and that fact that we are going to be the only integral part of the United Kingdom with a land Border with the European Union after we leave next year,” she said.

“There cannot be barriers to trade in the UK internal market which would damage the economic well-being of Northern Ireland and therefore we could not support any arrangements which would give rise to either customs or regulatory barriers within the UK internal market.

“It’s been a useful meeting today, we look forward to continued engagement over the next couple of days.”