The 14 men, who were jailed last year for taking bribes to cross the floor, had sought to have the convictions overturned by claiming parliamentary immunity.
They told the court that they were attending a session of Parliament when they were prosecuted and this is prohibited under the constitution.
Vanuatu media reports that some of MPs are expected to give evidence in the case next Tuesday, with Judge David Chetwynd due to sit at 9am on Wednesday before giving his decision in the constitutional case.
Source:
Radio New Zealand