The Police and Crime Commissioner for Gwent says the force is "in a better place" without the Chief Constable.
Earlier this month, Ian Johnston admitted telling Carmel Napier to retire or face being pushed out.
Both are due to be questioned by a group of MPs on the circumstances surrounding Mrs Napier's exit from the force.
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The world record attempt will raise money for the foundation set up in memory of the Olympic gold medallist, who died in May 2013.
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England manager talent spotting at Swansea City v Southampton at the Liberty Stadium