A change of personality in the role of British Prime Minister will not change the Irish Government's position on the Border backstop, the Tánaiste Simon Coveney has said.

His comments come as the prospect of a "no-deal" Brexit has been raised by some of the candidates in the Conservative party leadership campaign to replace outgoing leader Theresa May.

Mr Coveney was responding to questions from Fianna Fáil's Brexit spokesperson Lisa Chambers in the Dáil this afternoon.

She said that there appears to be "no moderate candidate coming forward and it is concerning to hear almost all the candidates openly talking about a no deal Brexit being a viable option."

Ms Chambers expressed concerns that Tory leadership candidates persist in discussing the possibility of a no-deal Brexit and some have raised the possibility of a "managed no-deal" today.

She asked for confirmation that there has been no change on the Government's position regarding the backstop following reports that Taoiseach Leo Varadkar is open to alternative arrangements on the backstop.

Mr Coveney said the Government's position had not changed and it does not change because there is a change in personality of British Prime Minister.

He said: "This has never been about personalities. It has always been about evidence and facts and trying to deal with the complexity of the decision of a country and economy the size of the UK decided to leave the European Union that it has been part of 47 years.

"The 57 trade deals it has in place, the €70bn trading relationship that it has with Ireland, the fact that we share responsibility for a peace process on this island - all of these things make the United Kingdom's exit from the EU very complicated. 

He added: "That is why the withdrawal agreement that deals with that complexity in terms of the divorce arrangements took two and a half years to negotiate. That is the EU's position and it is Ireland's position and it is not going to change with a new personality taking charge."

"Regardless of what is being said and what is being claimed, the facts don't change. And we need to be respectful in terms of what we say to the UK but I think we also need to be firm and consistent."

Taosieach Leo Varadkar will meet EU Chief Brexit Negotiator Michel Barnier on Thursday morning in Brussels ahead of the summit of EU leaders.

According to an EU source, the two men will discuss the state of play on the UK's withdrawal from the EU and will assess the Conservative Party leadership contest in London.

Senior EU and Irish figures, including Commission President Jean-Claude Juncker and the Taoiseach, have repeatedly ruled out any reopening of the Withdrawal Agreement, despite claims by candidates in the Tory Party leadership campaign that they would secure changes to the Irish backstop.

Last week, Mr Barnier said that the Brexit deal negotiated by Theresa May was the only one possible for an orderly withdrawal from the EU.

"I repeat calmly that the United Kingdom still wants to leave the European Union ... so the agreement that is on the table is the only agreement possible for an orderly withdrawal," he said.

"This is where we're at and we're waiting on the nomination of a new prime minister in London and what it will tell us, that's what matters," Mr Barnier told European and African senators meeting in Paris, including the speaker of Britain's House of Lords, Norman Fowler.

Officials say Brexit will only marginally feature at the two-day summit, which instead will focus on the appointment of senior positions within the EU institutions following last month's European Parliament elections.

Additional reporting Tony Connelly