The anti-immigration PVV came under attack in Thursday night's European election television debate for its links with France's far-right Front National.
The party's founder and current MEP Jean Le Pen has several convictions for racism and has described the Holocaust as an 'historical detail'. The PVV is hoping to form an alliance in the European parliament with the Front National and other far-right parties after the vote.
Marcel de Graaff, who is leading the PVV's European campaign, defended the relationship. 'The alliance we are looking for is based on political arguments,' he said. 'The Front National is led by Marine Le Pen. She has distanced herself from the words of her father.'