The leader of the Vanuatu opposition, Maxime Carlot Korman, has accused the Prime Minister Edward Natapei of causing division in the Melanesian Spearhead Group, and undermining the country's reputation.
This comes amid reports that MSG meetings are to be held from Thursday next week in Solomon Islands to try and mend the rift with Fiji caused by Mr Natapei cancelling a summit in Nadi in July.
Mr Korman claims Mr Natapei wants Fiji out of the MSG in the same way it's been suspended from the Pacific Islands Forum.
He says he's taken a divisive approach that doesn't reflect Melanesian values which emphasize dialogue.
Mr Korman says it'll be a miracle if Mr Natapei can convince his Fiji counterpart to attend the Solomon Island's summit.
Neither MSG secretariat, which is based in Port Vila, or Mr Natapei, could be reached for comment.