Claims that the Nice Treaty undermined Irish neutrality were scare stories which were "patently ridiculous", according the Minister of State for Health and Children, Mr Brian Lenihan.
Mr Lenihan, who is increasingly prominent in the party's daily news conferences, said the same people who were warning about conscription 10 years ago were now alleging "a vast conspiracy to force us into aggressive wars".
"If you were to believe this, you would have to believe that all of our European partners, including the neutral ones, are desperately plotting to get Ireland into a common army. This is patently ridiculous," he said.
"The people have the chance to vote for the strongest protection ever for our neutrality. If they vote Yes, future policy will be in their hands and can only change if they want it to."
A new section had been added to the proposed constitutional amendment, making it "the strongest-ever referendum proposal on our neutrality". This was in response to concerns aroused by "the consistent and loud distortions of the people who see an anti-neutrality conspiracy in everything," Mr Lenihan said.
Under the new amendment, Ireland could only enter a common European defence arrangement with the consent of the people.
In addition, a solemn declaration had been secured from every other member of the European Union saying that nothing in the Nice Treaty infringed in any way our neutrality.
Mr Lenihan claimed this was "a binding legal interpretation of the treaty".
Responding to questions, the Minister of State said the fact that Ireland was a member of NATO's Partnership for Peace and had signed up for the EU's Rapid Reaction Force (RRF) did not arise under the Nice referendum.
"The Nice Treaty is not concerned with either of these matters," he said. But he pointed out that the Government was not prepared to participate in the RRF without a UN mandate.
He criticised an anti-Nice slogan, "Goodbye UN; Hello NATO" which he said was totally at variance with the contents of the treaty.
The Minister of State for Overseas Development and Human Rights, Mr Tom Kitt, said door-to-door canvassing in his Dublin South constituency suggested a Yes vote of 52.3 per cent, with 19 per cent No and the rest undecided or not voting.
"People are able to differentiate between domestic politics and the historic choice they have to make." He described the No campaigners as "anarchistic" because they were not advocating an alternative to the Nice Treaty.
The Minister for the Environment, Mr Cullen, said there was a "very active" Fianna Fáil campaign, involving the whole organisation.
Senator Mary White said that, as a result of joining the EU, Ireland had been able to "leapfrog" Britain in economic terms.