The Irish prime minister says the UK Government should drop its Brexit "red lines" if it wants to reopen the Withdrawal Agreement.
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Taoiseach Leo Varadkar said the current deal, negotiated by Theresa May's Government, was arrived at because of the British negotiating position.
It comes as the Irish finance minister Paschal Donohoe said a Brexit deal that sees the UK enter into a transition agreement with the EU while a future relationship is negotiated "is still possible".
In an interview with the i newspaper in Belfast, Mr Varadkar said: "We ended up with the Withdrawal Agreement and the backstop because of all the red lines that were drawn up by the British Government.
"Now if we're going back to square one and those red lines are being changed, then we've something to talk about."
Mr Varadkar said if no deal happens "it will be as a consequence of decisions made in London".
He added that he was open to talks with Prime Minister Boris Johnson as he believed there had been some suggestion the Withdrawal Agreement was an "invention" of the Dublin government or had been imposed by the European Union.
"That's not the case," he said. "There's an attempt to make out that it's undemocratic too but it's been agreed by 28 governments, including the UK Government, and the European Parliament, all of which followed democratic procedures."
Earlier, Mr Donohoe said while a deal was "still possible", the prospect of no deal had increased.
He was in London as he met Chancellor Sajid Javid to discuss the UK Government's latest plans for exiting the EU.
Speaking to the BBC's Newsnight programme, he said a deal could be done.
He added: "I believe it is still possible that we could see agreements in which Britain enters into a transition agreement in advance of them finally departing before the European Union.
"But as I stand now, I'd have to be equally clear in saying that I do believe that the prospect of a no-deal Brexit has grown.
"I believe that a no-deal Brexit and the United Kingdom leaving the European Union without a deal is a very credible and material risk now."
Mr Donohoe said the appointment of Mr Johnson as Prime Minister had "added a new dynamic" to Brexit talks.
"I believe Prime Minister Johnson feels differently about the relationship between the United Kingdom and the European Union and the future trust of that relationship to how Prime Minister May would have," he said.
Australian Associated Press
