Australia's former Catholic Prime Minister has indicated that he may lead the case against same-sex marriage when Australians are asked next month what their opinion on gay marriage is. Tony Abbott, has led opposition from within government ranks to same-sex marriage and the faction he heads has repeatedly threatened to stabilise Australia's gay-marriage supporting Prime Minister. Malcolm Turnbull has promised that a national vote on same-sex marriage will be held before the end of the year. Mr Abbott told Parliament: "If you're worried about religious freedom, and freedom of speech, vote 'no' because voting 'no' will help to stop political correctness in its tracks." A postal ballot - which is not binding - will begin in September but the government will not legislate on the issue without it. If most Australians vote no, the government will not allow Parliament to consider lifting the nation's ban on same-sex marriage.