SINN Féin last night urged the Irish government and other EU member states to "hold firm" in the face of Brexiteer calls to ditch the backstop.
Speaking after talks with Tánaiste Simon Coveney at Parliament Buildings in Belfast, Sinn Féin vice-president Michelle O'Neill said her party had "highlighted the fears of Brexit and the implications".
Ms O'Neill described the discussions with Mr Coveney as "very constructive" and urged him to "stand up" for people in Northern Ireland.
"As this unfolds it is crucially important that the Tánaiste and the Irish government continues to stand up for the people here in the north," she said.
"I put it to the Tánaiste that the DUP are on the wrong side of this argument, they bizarrely are actually turning their face against the interests of the citizens here.
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"As we see how this unfolds in the next number of days and weeks, I think it's vitally important that the Irish government holds firm, along with the other member states, who gave assurances yesterday that they will remain firm, that there is no room for renegotiation or reopening up the negotiation that has already happened and concluded."
Ms O'Neill said a no-deal "crash out" would be "catastrophic".
"The ramifications are just unthinkable," she said.
