Socialist Party MEP Joe Higgins has strenuously denied falsifying part of the Lisbon Treaty in his No vote campaign material.
Yesterday, Civil and Public Services Union General Secretary Blair Horan accused the Mr Higgins of changing part of the Treaty to suit his own arguments.
Mr Higgins has admitted that his website contains an incorrect version of article 52 of the Charter, but described Mr Horan's allegation as 'a disgusting Stalinist ploy'.
'I ask Blair Horan, are we lying when we saying that Article 52 of the Charter - all seven paragraphs of it - places limits on workers' rights?'
Earlier today Taoiseach Brian Cowen said voters should put aside their feelings about the Government when voting in next month's referendum on the Lisbon Treaty.
‘This is not about whether you support or oppose the government, or agree or disagree with Brian Cowen,' Mr Cowen said at a party conference in Sandyford.
'If you are frustrated or angry about our current economic challenges, here is one specific opportunity for you to do something positive about it,' he told delegates.
Also on the Yes side, Minister for Foreign Affairs Micheál Martin and EU commissioner Margot Wallstrom attended a pro Lisbon gathering of 290 companies and associations involved in foreign trade.
The Workers Party also launched its anti-Lisbon Treaty campaign today, claiming that it weakens workers' rights.