The American Civil Liberties Union has vowed to mount a legal challenge if South Dakota passes a law banning gender-change treatment for children under 16.

The bill seeks to make it illegal for physicians to perform surgeries, administer hormone therapy or give puberty-blocking medication to children under 16 who want to change their gender.

It will be heard on the floor of the South Dakota House next week.

The ACLU says it’s unconstitutional to single out a group of people with a law and categorically ban healthcare that is medically necessary.