Government ministers will be checking themselves this morning.
It comes as Stuart Nash has been dismissed from Cabinet.
It's emerged the Napier MP emailed donors about private cabinet information around a 2020 rent relief package.
Political Editor Jason Walls told Kate Hawkesby there will be a few ministers who will be wondering whether they've accidentally breached the Cabinet manual.
He says Prime Minister Chris Hipkins has, on a number of occasions, reinforced the importance of ensuring they're on the right side of the manual.
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