Arkansas became the first state to ban gender-confirming treatments and surgery for transgender people under 18 years old.
On Tuesday, the Republican-controlled legislature overrode Republican Gov. Asa Hutchinson's veto of the measure.
Hutchinson says he doesn't support interfering with parents and doctors or cutting off care for young people already receiving treatment.
"House Bill 1570 would put the state as the definitive oracle of medical care overriding parents, patients and healthcare experts," he said. "While in some instances the state must act to protect life, the state should presume to jump into the middle of every medical, human and ethical issue. This would be and is a vast government overreach."
The measure is set to take effect in late July, but the American Civil Liberties Union said it planned to challenge the measure before then.
Additional reporting by The Associated Press.
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