Tánaiste and Minister for Foreign Affairs Simon Coveney has dismissed the idea of using any form of infrastructure or technology on the border on the island of Ireland post-Brexit.
Mr Coveney has said cameras, scanning systems and drones would be unworkable and would put the Good Friday Agreement at risk.
In an interview with the BBC, to be broadcast this morning, he calls for a shared customs territory, where the same rules and regulations would apply to both sides of the border.
Feeding the British after Brexit
Theresa May insists she can be trusted to deliver Brexit
Meanwhile, British Prime Minister Theresa May has moved to try and ease cabinet tensions by insisting she can be “trusted” to deliver Brexit.
Her comments came after Cabinet divisions broke into the open after proposals for a customs arrangement with the EU were branded “crazy” by Foreign Secretary Boris Johnson.
Writing in The Sunday Times, Mrs May said: “You can trust me to deliver. I will not let you down.”
Mrs May stressed the UK would be aligned with Brussels on some issues as there had to be “compromises” after withdrawal.
She said: “So, Brexit means that, while we may sometimes choose to take the same approach as the EU, our laws will be made in Westminster, Cardiff, Edinburgh and Belfast, with those laws tried by British judges.”
And in comments that appeared to echo Mr Johnson’s controversial pledge that Brexit would trigger a major boost for the NHS, the PM said: “I will ensure that we take back control of our money.
“We have agreed a settlement with the European Union and the days of vast contributions from taxpayers to the EU budget are coming to an end.
“So, Brexit means there will be billions of pounds that we used to send to Brussels which we will now be able to spend on domestic priorities, including our National Health Service.”
Mrs May has divided the cabinet into two groups to consider the customs options being looked into.
The customs arrangement with the EU that Mr Johnson opposes would see the UK collecting tariffs on behalf of Brussels.
An alternative option called maximum facilitation, known as “Max Fac”, would rely on new technology and trusted trader schemes to get trade to flow smoothly with the EU after Brexit.
Mrs May added: “The path I am setting out is the path to deliver the Brexit people voted for.
“Of course, the details are incredibly complex, and, as in any negotiation, there will have to be compromises.
“But, if we stick to the task we will seize this once in a generation opportunity to build a stronger, fairer Britain.”