(DUBLIN) - Ireland's key referendum to ratify the EU reform treaty will probably be held in mid-2008, Prime Minister Bertie Ahern told parliament Wednesday.

Ireland is constitutionally bound to hold a referendum on potential changes to the way the country is governed.

It is expected to be the only country to hold a nationwide plebiscite on the treaty, the text for which was agreed at a meeting of EU leaders in Portugal last week.

"There will be a huge focus on this country as it looks almost certain now that we will be the only country that will have a referendum," Ahern told lawmakers.

"We will not be just dealing with the issue within our own shores, We will obviously have attention by those outside it as well."

Ahern told main opposition Fine Gael leader Enda Kenny there was a need for the parties to co-operate in the referendum campaign.

"It is necessary and I will consult with you on timing. My sense is probably that summer is the best time (for the vote) but there are a number of issues we have to reflect on between now and Christmas," Ahern said.

Before the plebiscite to amend Ireland's constitution, parliament has to pass legislation so it can be held.

A referendum commission will also have to be established to explain the issues surrounding the treaty to voters.

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