In addition, the committed Brexiteers among the DUP argue that if, over time, Northern Ireland diverges from the trading regulations applied elsewhere in the United Kingdom, it could create a barrier to trade within the United Kingdom and prevent Belfast benefiting from any deals London might negotiate in the future.
Despite intense discussions over the weekend over the border issue, Irish officials said on Sunday night that "there is still a way to go".
The EU and United Kingdom failed to reach an agreement on sufficient progress towards a Brexit deal Monday following a key lunch between Theresa May and Commission President Jean-Claude Juncker.
"I accept that the Prime Minister (Theresa May) has asked for more time, and I know that she faces many challenges, and I acknowledge that she is negotiating in good faith", he added.
Taoiseach 'surprised and disappointed' with British government after failure to reach agreement on Irish border
May and European Commission President Jean-Claude Juncker fell short of a breakthrough, despite some encouraging progress on the Irish border issue. "But on a couple of issues some differences do remain which require further negotiation and consultation".
May and Juncker made no comment to reporters when they met at the European Union executive's Berlaymont headquarters for a lunch that diplomats and officials hope can seal a breakthrough that would open the way to negotiations on future trade relations.
The EU and the United Kingdom are nearing agreement on some divorce terms, including the size of the bill that Britain must pay as it leaves and the rights of citizens affected by Brexit. But she said talks would reconvene later this week "and I am also confident we will conclude this positively".
"We now have a common understanding on most related issues with just two or three open for discussion". Both sides would promise to maintain compatible trading rules, keeping the border transparent for trade. But then Northern Ireland's Democratic Unionist Party, which props up May's minority government, announced it wouldn't support any deal that made special rules for Northern Ireland.
"And the problem between the Republic and Northern Ireland is a effect of the British decision not only to leave the EU but also the single market and the customs union". "Getting closer to sufficient progress at December #EUCO".
Jaitley: India has standardised itself for growth rate of 7-8%
The finance minister said a cogent GST mechanism has been developed and no country in the world has 5 per cent tax rate. China remained ahead of India for a third quarter in a row in July-September, posting 6.8 per cent growth.