"When there is an attack on London, we in Ireland feel it is nearly an attack on us as well", Varadkar said.
Northern Ireland is now without a government, after a surge in support for Sinn Fein at Northern Irish Assembly elections earlier this year left nationalist parties holding a majority over unionist ones the first time.
Detractors of the pact include former Conservative prime minister John Major, who said it risked Westminster's neutrality in an ongoing and fragile process.
"As long as progressive social policies are not imposed by a British government on the Northern Ireland Assembly, the DUP are not interested in changing such policies in Britain itself", Mr McCartan reckoned.
May is negotiating with the DUP, in an effort to ensure the Northern Ireland party backs her Conservatives in the House of Commons, where she does not have a majority, having failed to win an overall majority following the snap election she called, June 8.
The DUP has rejected Sinn Féin's red line, telling republicans they will not dictate who leads unionism and questioning the logic of taking action against Mrs Foster before a public inquiry has delivered its findings.
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Meanwhile, Chancellor Philip Hammond has been urged to publish the costs of any deals made with the DUP to prop up a Tory government. It isn't certain, it is under stress.
In fact, if good will were to exist all round, the reverse would be the case and Northern Ireland could benefit significantly from the arrangement.
Sinn Fein and the DUP had already fallen out and power-sharing had been suspended. "What would happen then?" she asked.
David Hanson, Labour MP for Delyn, served for two years as a minister of state for Northern Ireland and spent hours in negotiating chambers with PM Theresa May's potential new bedfellows. Sinn Fein and others have argued that any deal in which the DUP formed part of a United Kingdom government would worsen the current situation.
However, in January, Sinn Fein pulled out of the government over a corruption scandal involving DUP leader Arlene Foster, who is now negotiating with May.
Delegations from Northern Irish Parties met the Prime Minister at Downing Street to express their concern at the impact a deal with the DUP could have on efforts to reconvene the powersharing executive.
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