The Vanuatu Opposition has called for an extraordinary session of Parliament to debate a motion of no confidence in the prime minister, Edward Natapei.
The leader of the opposition, Maxime Carlot Korman, says he has the backing of 27 of the 52 MPs.
Mr Carlot Korman says if the Speaker of parliament, George Wells, accepts their motions, the extraordinary session could take place next Monday.
He claims that 9 government back benchers have joined with the 18 current Opposition members to submit the motion.
Last week Mr Carlot Korman accused Mr Natapei of causing division in the Melanesian Spearhead Group by cancelling July's summit in Fiji.
He says Mr Natapei no longer commands the majority and should resign with immediate effect.
Mr Natapei is currently in Japan on official business.