The operation of any Brexit deal would have to involve the Stormont Assembly, according to the Democratic Unionist Party.
DUP MP Jeffery Donaldson said this did not mean that the Northern Ireland assembly would have a veto over any agreement.
He told RTÉ's Your Politics podcast that his party wanted a deal "to ensure we don’t have a hard border" on the island of Ireland.
Mr Donaldson made the comments following speculation that the British government could propose a "Northern Ireland-only" backstop which would see a border down the Irish Sea as opposed to a border on the island of Ireland.
But Mr Donaldson warned about the economic effects of tariffs between Northern Ireland and Britain in the event of such a proposal.
He said duties between Northern Ireland and Britain would "be disastrous for our economy when you consider from Belfast port some 70% of our goods are going to Great Britain."
Presenter Aine Lawlor is also joined by Mícheál Lehane, Sorcha Ní Riada, David Murphy and Paul Cunningham of RTÉ’s political staff.
They also discuss the Budget, the beef dispute and upcoming by elections.
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