BOSTON (AP) — Gov. Charlie Baker is unveiling legislation he says will let the state add up to a dozen new or expanded charter schools each year outside an existing cap on the schools.

Baker says the bill will focus the new growth in the lowest performing districts.

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The bill unveiled Thursday would also let the schools use a system that gives additional weight to high-need and low-income students, as well as students learning English and students with learning disabilities.

Baker, a long-time charter schools supporter, says the legislation will help give every child the opportunity to a high-quality education regardless of their zip code or background.

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About 80 charter schools currently operate in Massachusetts.

Opponents say the proposal, which echoes the language of a proposed ballot question, would undermine public schools.

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