SACRAMENTO, Calif. (AP) — A proposal aimed at removing the last remnant of slavery from California law failed to pass the state Senate on Thursday after Gov. Gavin Newsom’s administration warned it could cost taxpayers billions of dollars by forcing the state to pay prisoners a $15-per-hour minimum wage.

The U.S. Constitution bans slavery but says it’s OK for the government to force people to work — known as “involuntary servitude” — as punishment for a crime. Many state constitutions say the same thing, including California’s.

Some state lawmakers wanted to change California’s Constitution to ban all forms of involuntary servitude. They wrote an amendment and planned to put it on the ballot this fall for voters to approve. But Thursday, the California Senate rejected the amendment over concerns of how it would impact the state prison system, which requires inmates to work and often pays them less than $1 per hour.

Lawmakers could try again next week. But if the amendment doesn’t pass by June 30, it won’t be on the ballot this year.

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