Arlene Foster – the leader of the party propping up the Tories in power – blamed Ms May personally for the setback, saying: “This is a difficulty of the prime minister’s own making.”
She said: “The prime minister has promised to get legally binding changes.
“The reaction by the EU is unsurprising. They are doing what they always do. The key question is whether the prime minister will stand up to them or whether she will roll over as has happened previously.”
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EU leaders scrapped proposed written commitments, designed to help her pass her deal through parliament, in frustration at the prime minister’s inability to set out clearly what she wanted.
The 27 heads of state and government opted to delete lines from their council conclusions, which would have said the EU “stands ready to examine whether any further assurance can be provided”.
In her statement, Ms Foster added: “This is a difficulty of the prime minister’s own making. A deal was signed off which the prime minister should have known would not gain the support of Parliament.
“If the prime minister had listened to our warnings and stood by her public commitments, we would not be in this situation.”
The Independent has launched its #FinalSay campaign to demand that voters are given a voice on the final Brexit deal.