France's Socialist prime minister is expressing support for local bans of burkinis, saying the swimwear is based on the "enslavement of women" and therefore incompatible with French values.

The burkini, a wetsuit-like garment that covers the torso, limbs and head, has prompted a growing national discussion about Islam and women's bodies, even though it's only worn by a handful of Muslims.

Three French Mediterranean towns have banned the garment on beaches this summer, citing security concerns after a season marred by deadly extremist attacks. Critics say the bans are discriminatory and could inflame religious and social tensions.