Michael Fitzmaurice said the Republic of Ireland should ask its citizens whether the country votes in favour of the UK’s eventual exit deal.
The independent Teach Dala (TD) said Brexit could go “pear shaped” for Ireland as well as Britain, both economically and politically.
Mr Fitzmaurice said the country was therefore entitled to do everything in its power to block a hard Brexit, which would involve British trade tariffs and a hard border between the Republic and the north of Ireland.
The Irish people should deserve a referendum on this
The TD for Rosscommon-South Leitrim told Ireland’s parliament on Tuesday: “If democracy is anything that we all believe in, the Irish people, in one of the most important of their lives, should deserve a referendum on this.
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Michael Fitzmaurice has demanded an Irish referendum on accepting a hard Brexit
“If this goes pear-shaped their is serious consequences for us.”
He said the impact on Irish farming by a hard border would have a devastating knock-on effect in Ireland and Britain.
Michael Fitzmaurice told Ireland's parliament the country deserved a referendum
Mr Fitzmaurice said: “If there isn’t an [exit deal] agreement there is massive consequences for the beef industry, dairy industry and sheep industry in this country.
“If there is a thing called a hard border, farming in Ireland will be demolished.
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“To put it bluntly: Britain needs our food and we need them to buy it."
He warned London "is only one day away from a shortage of food" and called on Irish leader Enda Kenny to announce an Irish referendum.
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Mr Fitzmaurice said: “Our Taoiseach should go out there and announce it to them, put them out of joint if they have to, and say we are going to hold a referendum on this decision.
“If it’s a thing that there’s a hard border, if it's a thing where there isn’t free travel and if it's a thing where there’s tariffs on our produce, we are entitled to a referendum to decide on what are we doing as a nation.
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“I would urge the Taoiseach to do this in the interests of democracy. Europe might have a lot of unelected reps doing things for them, but if we believe in democracy we will give that opportunity to our people.”
He also praised the way Spain had ensured a Brexit veto on Gibraltar as a "masterstroke".