Parliament will honour the death of murdered Constable Matthew Hunt today with the leader of each party making a speech.
National's speaking slot will be taken by its justice spokesman Mark Mitchell, who knows the Hunt family and is a former policeman.
National leader Todd Muller said he'd made the "unusual decision" because there was "no better voice" to honour Hunt and his family.
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Muller also gave his personal condolences to Hunt's family and said his family stood in solidarity with them.