DUP MP Jeffrey Donaldson has repeated his call for the Irish government to agree a specific timeline for the backstop - the insurance mechanism to avoid a hard border on the island of Ireland.
The impasse in Westminster, where a vote on the backstop was defeated three times, was caused by Ireland, he told RTE radio’s Morning Ireland.
Any refusal to address the backstop means that the UK is heading towards a no-deal Brexit, he warned.
Mr Donaldson said that the agreement signed between British Prime Minister Teresa May and the EU on the backstop was not legal because she did not have the authority to sign a deal without the approval of parliament.
“Dublin knows what the problem is.”
He said he is asking for a time frame on the back stop so people will know that it is temporary and not indefinite.
"That’s the only problem. Parliament (UK) could agree if that was removed.”
He added that from the start he had not wanted a hard border and the UK government had recognised that there needed to be an agreement on both sides to avoid a hard border.
It was not in Ireland’s interests to have a no-deal outcome, “but that’s where we’re heading now. That is not in Ireland’s interests.
“50% of Ireland’s beef goes to the UK. Is it in the interest of Irish farmers that there is no deal?”
Mr Donaldson said he was disappointed that the Taoiseach Leo Varadkar was heading for a no-deal situation because of the backstop.
When asked about the Tory leadership race, Mr Donaldson said the DUP had talks with the contenders to express their concern about the backstop. The DUP’s agreement is with the Conservative Party “and by extension with the Prime Minister, we will work with whoever that is".
“I do hope we can resolve this issue to avoid a no-deal Brexit and a hard border. I hope the Irish government will work with us to enable us to move to the next stage.”