Nigel Farage has said he has no plans to join alongside France's Front National in building a new international alliance united on an anti-European Union agenda, within Brussels.
Mr Farage said the Front National party, currently led by Marine Le Pen, contained "deeply embedded" elements of anti-Semitism, that he could not reconcile.
Jean-Marie Le Pen, founder of Le Front National, was convicted for Holocaust denial, which he described as a "detail of history."
Miss Le Penn has attempted to distance herself from her father's criminal sentiments (Holocaust denial is prosecuted as a against humanity and complicity in condoning war crimes in France), and denies that the party are anti-Semitic.
Speaking to ITV News Europe Editor James Mates, Mr Farrage said he was not convinced the party had managed to shed its past.
Whatever Marine Le Penn is trying to do with Le Front National, anti-Semitism, is still deeply embedded in that party, and for that principle political reason, we are not going to work with them now, or at any point in the future.
Miss Le Pen is attempting to build a powerful anti-Europe alliance in Brussels as her party continues to make great political gains across France.
The Dutch anti-Muslim and Freedom Party leader Marine Geert Wilders appealed to Farage to join him and Le Pen in their initiative.
The pair are in talks with anti-immigration, anti-EU parties in Sweden, Austria, Belgium and the Netherlands. Across Europe, as the fortunes of millions of voters continues to dwindle under austerity, right-wing parties continue to enjoy ever greater electoral success.
Europe Editor James Mates said the sharp move to the right has left parties that were once considered unelectable actually winning elections across the continent.
Many of these parties have racist roots, and together they have the potential to make a huge impact on EU law-making processes. He describes:
Some of these parties are much more rooted in anti semitism and racism than others - but they all have at thier core anti immigration and anti EU. If these parties get together, even if UKIP don't formally join them, if they get together in any sort of way in the next year, they could have 30% of the seats, and make decision making in the UK very very hard.