Two of the men who were signatories to the Vanuatu constitution 33 years ago say plans by the government to allow dual passports is a violation of the country's sovereignty.
The passport changes are part of the government's proposed Capital Investment Immigration Plan.
The first leader of the opposition when Vanuatu got its independence in 1980, Vincent Boulekone, says there would need to be a referendum to ask the people if they agree to the dual passport plan.
Currently under the constitution a citizen is only allowed one passport.
If a foreigner wants Vanuatu citizenship, he or she has to renounce the passport of his or her country of origin.
Mr Boulekone says allowing foreigners to have Vanuatu passports goes against the beliefs of the founders of Vanuatu's independence.
Another signatory, the country's first president, Ati Georges Sokomanu, says there are other ways for the government to raise money without relying on selling passports.
And he says even if there was a referendum, he would remain opposed to dual passports.
