United Future leader Peter Dunne could be hauled before the privileges committee over his denial that he leaked a GCSB report to a journalist, and that committee is likely to have the power to compel the handover of emails Mr Dunne has withheld.
The privileges committee is a group of MPs which hears cases such as misleading the House. It can summon people, papers and records, which potentially extends to requiring the Parliamentary Service to hand over the emails on its server.
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