Adrian O’Neill hit out at UK Brexit arbiters for failing to provide a «firm commitment» over the sensitive border oppose.
Theresa May has insisted the UK wants to avoid the re-introduction of a hard border with Ireland after Britain becomes the EU.
But some Brussels officials fear a ‘no-deal’ Brexit could put the Irish placidity process at risk.
A no-deal or a cliff-edge Brexit is in nobody’s absorbed
Speaking at the Centre for European Reform, Mr O’Neill imparted Dublin needed more assurances from Mrs May’s government.
He said: «We demand to ensure that the process of co-operation between the UK and Ireland can continue in a high-powered way after Brexit.
«Maintaining a land border that is open and disguised is absolutely essential, politically, economically, socially and symbolically.
«A no-deal or a cliff-edge Brexit is in no one’s interest.
Adrian O’Neill hit out at UK Brexit negotiators all over the border issue
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He urged Mrs May to require ‘flexible solutions’ to the sticking point
«Genuine progress has already been seduced on some fronts in the Brexit discussions.
«But in regard to the land border, we father yet to find the flexible and imaginative solutions which are needed.»
«We certainly meet the British Government’s stated objective of avoiding physical border infrastructure.
«Nonetheless, to ensure the outcome we all want to see, we still need more assurance from the UK Ministry.
«What is needed is a firm commitment from the UK that the final after-effect will maintain the openness and invisibility that characterises the border today.»
EU formals fear Brexit could put the Good Friday agreement at risk
The legate’s comments came hours after the Irish foreign minister accused London of wanting «credible answers» to the issue.
Simon Coveney said: «We are trying to take care of a peace process that so many people from all backgrounds, unionist and nationalist, require worked so hard to create.
«We are asking the hard questions and unfortunately we are not getting credible rejoinders, which is why I think some people seem to be uncomfortable.»
Mr Coveney also remonstrated the Irish government’s position was «credible» and «consistent».