The leader of the opposition in Vanuatu, Edward Natapei, claims they now have the support of a clear majority of 34 MPs in the 52 seat parliament.
On Friday, three government ministers resigned from the coalition.
Their resignations followed the submitting of a motion of no confidence against prime minister, Sato Kilman.
The 29 MPs who signed the motion also requested an extra-ordinary session of parliament to take place in 7 days to debate the motion.
Mr Kilman stepped up from Deputy Prime Minister last December after ousting Edward Natapei from the top job in a no-confidence vote.
The 29 MPs who signed the motion also requested an extra-ordinary session of parliament to take place in 7 days to debate the motion.