In response Mr Shewan said he was unfazed by the challenges to his integrity – which were part of politics.
He had worked on tax issues for 38 years he said and it was ‘entirely normal’ to have interactions with tax authorities and for some of those cases to go to court.
But he took issue with claims by Labour leader Andrew Little in Parliament today that he had advised the Bahamas Government on protecting its financial sector from tax changes.
In 2014 Mr Shewan and former National Party leader Don Brash travelled to the island nation to provide advice on GST changes.
The trip was arranged after a meeting between Prime Minister John Key and Bahamas Prime Minister Perry Christie.
Mr Little said in the House this afternoon that Mr Shewan and Dr Brash had effectively advised the Bahamas – a country known for tax haven activity – on how to protect its offshore financial services industry and maintain its haven status.
Appointing him to lead an inquiry on New Zealand’s offshore trusts industry showed a lack of judgement he said.