The way forward for the British territory is a serious excellent drawback for Mrs Might, with Spanish Prime Minister Pedro Sanchez threatening to vote towards the Brexit settlement over the row.
Spain is demanding that the way forward for the Rock is settled by way of direct talks between London and Madrid.
However diplomats in Brussels have accused Mr Sanchez of attempting to attain factors with voters forward of a regional election in Andalusia – which shares a border with Gibraltar – on December 2.
One main diplomat informed Politico: “It appears Sanchez has his eyes on the elections in Andalusia.”
The vote might be socialist Mr Sanchez’s first check below his management and a robust worldwide battle will seemingly increase his reputation within the vote.
It comes after Mr Sanchez vowed to vote towards the Prime Minister’s Brexit settlement except the bitter dispute is resolved.
The Spanish Prime Minister mentioned that his authorities was “aggravated” that the divorce deal didn’t state that Gibraltar’s future can be determined between Spain and London.
Mr Sanchez added: “If this isn’t solved by Sunday, Spain, a pro-European authorities, will sadly need to vote ‘No’.”
Fellow EU nations are livid with Mr Sanchez’s stance with Eire’s international minister Simon Coveney saying: “In the event you reopen [the Withdrawal Agreement] for one challenge, effectively then there may be an avalanche of different asks, I’m certain, that totally different nations may have.”
And an EU diplomat added: “We’re following the most recent developments with rising concern and incomprehension.”
However final evening Mrs Might insisted that there had been “good engagement” between the UK, Spain and Gibraltar.
A Downing Road spokesman mentioned: “She mentioned there had been good engagement between the UK, the federal government of Spain and the federal government of Gibraltar with the intention to come to an settlement within the withdrawal settlement and related bundle of memoranda of understanding regarding Gibraltar.
“She mentioned that the UK and authorities of Gibraltar regarded ahead to those discussions persevering with as we talk about the long run relationship.
“The Prime Minister reiterated her dedication to agreeing a deal that works for the entire UK household together with Gibraltar, the opposite UK abroad territories and the crown dependencies.”
The difficulty of Gibraltar is believed to be the ultimate impediment from EU leaders that Mrs Might faces.
Earlier issues over fishing and commerce have been addressed, in accordance with an EU diplomat.
The supply mentioned: “The one factor actually excellent is Gibraltar.”
Mrs Might is returning to Brussels on Saturday for crunch talks with European Fee President Jean-Claude Juncker forward of the leaders’ summit.
Gibraltar has been a British territory since 1713 however Spain has lengthy claimed sovereignty.
Within the 2016 EU referendum 96 % of Gibraltar’s inhabitants voted to reman within the EU.