Taoiseach (Irish PM) Micheál Martin has said it would be “irresponsible and reckless” for the UK to use Article 16 of the Northern Ireland Protocol.
It is the provision which allows parts of the protocol to be unilaterally suspended if they are causing serious difficulties.
The UK government said in July it believed the threshold for using Article 16 had been reached.
There is growing speculation that the UK will trigger it in the coming weeks.
Last month UK Brexit Minister Lord Frost said: “We would not go down this route gratuitously or with any particular pleasure.”
Speaking in the Dáil (Irish parliament), Mr Martin said such a move would have “far reaching implications” for the relationship between the UK and EU.
He said it would also not be “in accordance with the spirit of partnership that has informed the peace process”.
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