"Mr Varadkar knows full well the connotations of such statements and he knows it's nonsense", Mr Campbell.
In a worst-case scenario, a hard border could "involve people in uniform and it may involve the need, for example, for cameras, physical infrastructure, possibly a police presence, or an army presence to back it up", Varadkar said in a Bloomberg Television interview at the World Economic Forum on Friday.
"But the reality is that this isn't about breaking down the border, this is about reminding people not to impose a border".
He told BBC Radio Ulster: "International obligations could see both the British and Irish governments forced to put customs posts and those custom posts might need to be protected by armed guards".
He added that Brexiteers who were against the backstop, but also claimed that they were against a hard border, were being contradictory.
"We want a legal guarantee and an operable mechanism which will ensure that we don't lose all the progress that's been made over the last 20 years in Ireland in terms of our peace process and the Good Friday Agreement", Varadkar said.
He said the government would not be giving up on the "backstop" plan for promises that the border issue would be rectified at a later date.
"The UK wanted a review clause in the backstop and we agreed to that, the UK wanted a UK-wide element, so why is it the country that is being victimised is the one that's always asked to give?"
BCAB say they aim to show that the local community will not tolerate border Infrastructure that would divide the community and destroy their way of life. The Guardian newspaper wrote, "Ministers have not formally backed any of the anti-backstop amendments, which are incompatible with the deal that May agreed with United Kingdom leaders, but if one were to pass by a majority, she would be able to present the European Union with a firm idea of what changes might get her deal through parliament - something that as yet remains unclear to Brussels".
"Britain and Ireland are two islands next to each other - we have to work out these things together and stop talking about games of chicken".