The Public Service Minister has penned an open letter to New Zealanders before a major mega strike this coming week.

An estimated 100,000 workers across the health and education sector plan to walk off the job on Thursday. 

Minister Judith Collins says the strikes will impact children and families and believes they appear politically motivated. 

She says primary school principals have taken a more commendable approach. 

"They've been able to reach a very good settlement by staying at the bargaining table, and this seems to be very much focused on politics, rather than the actual outcomes."

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