He said the laws send a problematic message to students and he is calling on state legislatures to repeal them.
“My hope is legislators will realize they’ve made a terrible mistake,” he said.
The North Carolina law requires transgender people to use bathrooms in state government buildings and public schools and universities that correspond to the gender on their birth certificates. It also established statewide anti-discrimination protections that exclude LGBT people, and it bans communities from passing anti-discrimination ordinances that go further.
Last month, President Barack Obama called for the law to be overturned.
Transgender advocates and the Obama administration have argued federal anti-discrimination law requires that transgender students be able to use the restroom and locker room that correspond with their gender identity.
A federal appeals court ruled last month in a Virginia case that a high school discriminated against a transgender teen by forbidding him from using the boys’ restroom. The U.S. 4th Circuit Court of Appeals sent the case back to a lower court for trial rather than issuing a definitive decision.