Pope Francis has warned gender theory is part of a "global war" against traditional marriage and the family.

"You mentioned a great enemy of marriage: gender theory," the Pope said, in response to a question at a meeting of Catholics in the ex-Soviet republic of Georgia on Saturday

He continued: "Today, there is a global war out to destroy marriage.

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"Not with weapons but with ideas... we have to defend ourselves from ideological colonisation."

Gender theory is broadly the concept that while a person may be biologically male or female, they have the right to identify as male, female, both or neither.

The Pontiff has used the phrase "ideological colonisation" in the past to denounce what he says are attempts by rich countries to link development aid to the acceptance of social policies, such as allowing gay marriage and contraception.

"Marriage is the most beautiful thing that God has created," he said, adding that the bible says God created man and woman to become one flesh in apparent reference to homosexuality.

While he has been more accepting of homosexuality than his predecessors, Pope Francis opposes gay marriage.

Shape Created with Sketch. Pope Francis gives life advice: in pictures Show all 10 left Created with Sketch. right Created with Sketch. Shape Created with Sketch. Pope Francis gives life advice: in pictures 1/10 Pope Francis' guide to happiness Pope Francis: 'Live and let live.' GETTY IMAGES 2/10 Pope Francis' guide to happiness Pope Francis: 'Proceed calmly" in life' AFP/Getty Images 3/10 Pope Francis' guide to happiness Pope Francis: 'Be giving of yourself to others' AFP/Getty Images 4/10 Pope Francis' guide to happiness Pope Francis: 'Even though many parents work long hours, they must set aside time to play with their children' AFP/Getty Images 5/10 Pope Francis' guide to happiness Pope Francis: 'Sunday is for family' AFP/Getty Images 6/10 Pope Francis' guide to happiness Pope Francis: 'Respect and take care of nature' OSSERVATORE ROMANO/AFP/Getty Images 7/10 Pope Francis' guide to happiness Pope Francis: 'Stop being negative' AFP/Getty Images 8/10 Pope Francis' guide to happiness Pope Francis: Respect others' beliefs' AFP/Getty Images 9/10 Pope Francis' guide to happiness Pope Francis: 'Peace sometimes gives the impression of being quiet, but it is never quiet, peace is always proactive' FP/Getty Images 10/10 Pope Francis' guide to happiness AFP/Getty Images 1/10 Pope Francis' guide to happiness Pope Francis: 'Live and let live.' GETTY IMAGES 2/10 Pope Francis' guide to happiness Pope Francis: 'Proceed calmly" in life' AFP/Getty Images 3/10 Pope Francis' guide to happiness Pope Francis: 'Be giving of yourself to others' AFP/Getty Images 4/10 Pope Francis' guide to happiness Pope Francis: 'Even though many parents work long hours, they must set aside time to play with their children' AFP/Getty Images 5/10 Pope Francis' guide to happiness Pope Francis: 'Sunday is for family' AFP/Getty Images 6/10 Pope Francis' guide to happiness Pope Francis: 'Respect and take care of nature' OSSERVATORE ROMANO/AFP/Getty Images 7/10 Pope Francis' guide to happiness Pope Francis: 'Stop being negative' AFP/Getty Images 8/10 Pope Francis' guide to happiness Pope Francis: Respect others' beliefs' AFP/Getty Images 9/10 Pope Francis' guide to happiness Pope Francis: 'Peace sometimes gives the impression of being quiet, but it is never quiet, peace is always proactive' FP/Getty Images 10/10 Pope Francis' guide to happiness AFP/Getty Images

In the same answer, he also said the growing acceptance of divorce poses another threat to the family.

Last week, the Pope voiced his support for Mexicans campaigning against the legalisation of same-sex marriage.

He has previously warned that same-sex marriage threatens "the family" and could "disfigure God's plan for creation".

During his visit to Georgia, Pope Francis called for nations around the world to respect international law and the sovereign rights of other countries - a reference to the situation in Georgia, where Russian troops are based in two pro-Moscow breakaway provinces.

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