"In the absence of agreed alternative arrangements, no backstop is no deal for us," Varadkar said ahead of talks with his British counterpart, Boris Johnson.
"All it does is kick the can down the road for another 14 months; another 14 months of uncertainty for business, another 14 months of uncertainty for people north and south of the border.
So that's not an option that we find attractive at all." Varadkar said he would not replace a legal guarantee for the Irish backstop, an insurance agreement to prevent the return of border controls between Northern Ireland and the Irish Republic, without an specific alternative.
He said if there was no deal, Britain and the EU would have to get back to negotiations quite quickly to address citizens' rights, financial settlement and the Irish border, all issues which had been included in former Prime Minister Theresa May's withdrawal deal.
Varadkar warned even if a deal was struck, agreeing a future free trade agreement would be a "Herculean" task for Johnson.
British Prime Minister Boris Johnson was feeling "cautious" as he went into Brexit talks with European Commission chief Jean-Claude Juncker on Monday (September 16), as rhetoric from both men over the..