Key says it was just a casual conversation where he was asked about an issue, and used his standard tactic of deflecting the question to the Minister in charge of it. He says trying to make it into anything further is a desperate ploy.
The explanation requires us to take him at his word, as it's difficult to prove either way. His critics will hold it up as the smoking gun that proves he is linked to foreign trusts, our tax haven reputation, and that he only wanted to fix the problem when it was brought to the public's attention. His fans will say the email was penned by someone else, and proves nothing about the Prime Minister's stance on the issue.
READ MORE: The Antipodes email: John Key, his lawyer and foreign trusts
But problems with trust go across the political spectrum. It was the Green Party which uncovered the story, after some excellent investigation. Less good is that they then spoke to several media outlets, leaving at least three with the impression that they had an exclusive story.
It's not the end of the world, and it's still the Prime Minister who will face the most questions over this. But the Green Party might find media wary of them, the next time they uncover dirt on their opponents.
Frances Cook is a political reporter for Newstalk ZB
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