“If this scenario were to become a reality, we would be complying with regulations set by a body we were no longer part of and we had no input into.
“So where is the accountability?”
He added: “Those unionists who voted remain did not do so because they wanted to leave the United Kingdom and it is dishonest and deceitful to portray them as such.
“And they certainly didn’t vote for the backstop either.
“While you continue to swing wildly between assuring people the backstop is an insurance policy no one wants to then have to refer to it as the best of both worlds, it leaves the impression there are those out there who have their fingers crossed behind their back that the UK Government won’t get a good deal and we will default to the backstop.
“This position is as reckless as those chasing a hard, or even a no-deal Brexit.”
The British Government and unionists in Northern Ireland, where people voted overwhelmingly to Remain, have opposed any solution which would effectively see a regulatory border created down the Irish Sea between Northern Ireland and Great Britain.
The Irish Government wants to preserve good cross-border trade and peace on the island.
Mr Swann went on to issue a warning to Taoiseach Leo Varadker and Tanaiste Simon Coveney, saying that they should “tread carefully” and accused the Irish Government of working against the UK rather than with it.
He added: “Let me also be clear that we want a good relationship with our neighbours in the Republic of Ireland, but it’s very hard to maintain that when you continually poke us in the eye. Work with us, not against us.
“So I have a message for Leo Varadkar, Simon Coveney and their colleagues in the Irish Government. Tread carefully.
“Every day that you trample over the Belfast Agreement and the principle of consent, you do further damage to relationships across these islands.”