Duff wants legislation to ignore a No vote.
"This is one of the most undemocratic and treacherous ideas to have come out from the Lib Dems for a long while, and that includes their betrayal over tuition fees!" said UKIP MEP David Campbell Bannerman (pictured, right).
An unusually ferocious row has broken out between two of the Eastern region's Euro-MPs with one of them accusing the other of being a traitor to the electorate, over attempts to remove the UK's veto on EU treaty amendments.
The row comes as the UK government plans to introduce legislation that would require a country-wide referendum before any amendments to existing EU treaties could be made.
Under the current regulations, if the UK disagrees with a treaty amendment, it cannot be passed because all 27 member states have to be in agreement.
Concerned that the UK's Referendum Bill would slow down the progress of new treaties and amendments, Eastern Region Lib Dem MEP, Andrew Duff has suggested legislation
that could ignore a ‘no' vote from the UK, and bring the new rules in against the will of the people.
In a letter to Jerzy Buzek, the European Parliament President, the MEP suggests that agreement should be required by only 22 member states (four fifths of EU 27) for new treaty amendments to become law.
In the letter he states: "I believe the time has come to lighten somewhat the European Union's procedure for treaty revision."
UKIP MEP David Campbell Bannerman, also an MEP for the Eastern region said: "This is one of the most undemocratic and treacherous ideas to have come out from the Lib Dems for a long while, and that includes their betrayal over tuition fees!
"The only reason Mr Duff wants this amendment to the treaties is because he realises public opinion is fast turning against the EU, an institution he reveres, and he realises that without changes to the system public opinion is likely to prevent any further UK integration with the EU.
"He is trying to decrease the democratic power of the very people that trusted him with their vote and elected him to office, in my book that is nothing short of treachery.
"Effectively he is saying that when the British people disagree with him, they should have their democratic power overridden and ignored. This is democracy East German style. "
UKIP are calling for a referendum on whether the UK should remain a member of the EU.
Mr Campbell Bannerman added: "The proposals from Mr Duff would sap the UK Parliament of its last remaining shred of power, already diluted by successive EU treaties and regulations. It's official: The Lib Dems are neither Liberal nor Democratic, just agents of the EU Superstate."
"This is a particularly dangerous idea, and if it's taken on board our local MP will be rendered powerless - you can kiss goodbye to ‘the Mother of all Parliaments' for ever."