National's health spokesperson is suspicious of Ayesha Verrall's requested delay in publishing correct clinical performance data.

The Health Minister had corrected an answer to Parliament, admitting her office stopped data being released because of the timing of other Government announcements.

Shane Reti says there's something murky surrounding Ayesha Verrall's request, comparing it to Jan Tinetti's earlier actions.

"I think there is something uncomfortable with the minister so deeply interfering in operational events for the purpose of making one set of announcements look good."

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