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Winston Peters' parliamentary ban is heading into murky waters.
The Speaker of the House has trespassed Peters from Parliament for two years, - along with former National MP Matt King - after visiting the anti-mandate occupation in February.
Otago University Law Professor Andrew Geddis says while it's lawful, Peters could still bring legal action against the decision.
He says it could be argued that because Parliament is involved, it's being unused in an unreasonable manner.
Geddis says Peters will argue it's unreasonable, given his low involvement in the protest.