Ireland can not be asked to "compromise something as fundamental as the peace process" said Foreign Minister, Simon Coveney.
He spoke as Theresa May tried to try to change his / her withdrawal agreement.
However, he said that Ireland could show more flexibility after a bargain was made.
On Friday, its government revealed the main legislation prepared to manage a non-dealings scenario.
It covered a wide range of emergency measures that will be implemented if the UK leaves the EU without a bargain.
Sky Cove told Sky News, although the EU is firm on not changing the withdrawal agreement, it's trying to "give the British Parliament a certainty and explanation to allow them to confirm & # 39 ; r fargen hon ".
The prime minister is trying to renegotiate the backstop – the insurance policy to prevent the return of physical checks on the border between Northern Ireland and the Republic of Ireland.
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Mr Coveney said Brexit was "not just about Westminster".
"If Britain is for a deal, you can not ask Ireland to compromise something as fundamental as a peace and related process that is linked to the Good Friday Agreement to get an agreement," he said.
Mr Coveney added that the government situation "is about motivating a group in the Conservative Party that demands to move the prime minister away from his own policies".
"The backstop in the British government built as much as the European Union and Ireland government would build.
"This is about collective responsibility," he added.
He again reiterated the need for a guarantee to those in border counties that will not face the physical or security boundary infrastructure.
"Certainly that is not unreasonable," he said.
The UK is still on track to leave the European Union on March 29.
However, the government has refused to deny the possibility that the UK will formally leave, without a while, if Mrs May can not have MPs to approve the bargain that she was discussing with Brussels in time.
Mrs May is expected to hold discussions with the president of the European Council, Donald Tusk and other EU key figures in Egypt later during a summit between EU country leaders and a Arabian league.
But Downing Street has created hopes of development on its Brexit bargain that is being reached in Sharm el Sheikh.
The cup is the first between EU country leaders and a Arab League and will focus on addressing security and migration concerns and promoting trade.