COMMENT:

Jacinda Ardern arrives back today from her hugely successful and unique mission to Paris firmly focused on domestic challenges in the month ahead.

We will see some of them publicly enough such as the teacher strike the day before the May 30 Budget.

But some of the biggest challenge are less visible and involve strains within the Government.

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They are invariably about constraints: what constraints one party is placing on the plans of another; and constraints of voice – how much each party must limit what it says to avoid disunity.

And because they involve Labour's partners, New Zealand

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