From what we know this morning, it does not seem that the Budget 2019 leak was the result of any online break-in or "hack".

But experts are split on whether the Crimes Act was breached, given the person who obtained the Budget 2019 information knew that they should not have been searching for it or looking at it - even if it had been inadvertently been made public.

"What we did was what any Kiwi does any day of the week on Google," Opposition leader Simon Bridges told a press conference this morning.

"It's from within National and by chance

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The 'Keith Ng defence'

The question of dishonest purpose

Treasury's take