A leading national broadcaster has claimed a DUP MP told her they could build a border between the Republic and Northern Ireland "as high as they like".
Shelagh Fogarty was responding to a caller on her LBC show on Monday but did not name the MP as the comment was made to her "off the record".
The contributor claimed neither the DUP nor Sinn Fein wanted to see a hard border on the island of Ireland.
The former BBC broadcaster interjected: "Well you say the DUP don't. I won't name this particularly DUP MP but one said to me not that long ago... build it as high as you like... privately, build it as high as you like ... that wall that border."
She added: "It doesn't matter what the context is. If their passionate private view is build a wall between north and south that's their passionate private view.
"I only raise that comment because it puts pay to your idea nobody wants it, some people do want it."
Asked about the claim later on Twitter Ms Fogarty said the remark was said to her a "while back off the record".
Said to me a while back off the record.— Shelagh Fogarty (@ShelaghFogarty) October 1, 2018
The DUP has 10 elected MPs and the party has a confidence and supply agreement with the Conservatives propping up Theresa May's minority government.
The party has been contacted for a comment.
Previously party's deputy leader Nigel Dodds said the DUP is opposed to a hard border on the island of Ireland.
In an interview with the BBC in the summer he said that while they wanted "the best deal for Northern Ireland" the party did not want a hard border.
"We do want it to be absolutely frictionless and we don't want a hard border - but that can't be at the expense of erecting any kind of barrier or hinders to trade between Northern Ireland and the rest of the UK which is by far our biggest market.
"That is our concern - we want to see balance in all of this and ensure our best interests are protected."