Sinn Féin leader Mary Lou McDonald has urged the Taoiseach not to accept any checks on the island of Ireland in the event of a no-deal Brexit.
Ms McDonald said: "We are very concerned to hear the Taoiseach think out loud and to concede the point that there might be checks anywhere on the island of Ireland," Ms McDonald said.
"There can't be any check anywhere on the island of Ireland. That's entirely unacceptable. It would be an act of absolute political vandalism and wherever these checks might be located it would represent a serious breach of the Good Friday Agreement," she told RTÉ.
Ms McDonald said the Government had to prepare for the ultimate removal of the border following a no-deal Brexit.
"Europe has stated categorically there is a way back into the European Union for the North in the event of re-unification," she said.
She added that if the Conservatives could not reconcile themselves to the Backstop and there is a no-deal Brexit, "we are straight into the terrain of preparation to remove the border.
"We cannot envisage a re-partition of Ireland almost a century on," she said.
Subscribe or register today to discover more from DonegalLive.ie
Buy the e-paper of the Donegal Democrat, Donegal People's Press, Donegal Post and Inish Times here for instant access to Donegal's premier news titles.
Keep up with the latest news from Donegal with our daily newsletter featuring the most important stories of the day delivered to your inbox every evening at 5pm.