Vanuatu's Court of Appeal has reserved its decision on the Opposition challenge to this month's dissolution of Parliament.
The Opposition had appealed a Supreme Court ruling that the acting President, Roger Abiut, was within his rights to accept the Council of Ministers' decision to dissolve Parliament and call fresh elections.
The dissolution came after the Opposition had presented a motion for a vote of no confidence in the Government.
The motion had been presented to Mr Abiut in his role as Speaker of Parliament.
The Opposition says there was a clear conflict of interest for Mr Abiut and they want the dissolution overturned and election plans shelved.
The State Law Office says the Appeal Court will release it ruling on Friday afternoon.