National's Simeon Brown has slammed comments made by Te Whatu Ora's board chair on social media, calling it "appalling."

Rob Campbell has vented on social media over his disdain for National's Three Waters policy, and Christopher Luxon.

Brown told Mike Hosking Campbell is a senior public servant and should be setting an example.

He says public servants are meant to be politically neutral and he should be fixing waiting lists in our health system rather than providing commentary.

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