The French Polynesian party, Te Hono, says the French position on indigenous languages is an embarrassment for the territorial president, Gaston Flosse.
France has gone to court in Papeete in a bid to quash proposed laws to make Tahitian an official court language, with a ruling expected in April.
Last year, the French Polynesian parliament, including Mr Flosse's party, approved the change but France says it is unconstitutional.
The secretary-general of Te Hono, Tina Cross, says the French position goes against what the Polynesians want.
"President Chirac did not sign IN: PRESIDENT CHIRAC"
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Tina Cross says if the court rules in favour of France her party is prepared to take its cause to the UN.