DES MOINES, Iowa (AP) — Legislators in the Republican-controlled Iowa House have begun debate on a so-called “heartbeat” bill that seeks to ban most abortions in the state.

Lawmakers are expected to debate for hours Wednesday over the legislation, which would ban most abortions once a fetal heartbeat is detected. That’s usually around six weeks of pregnancy.

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The measure would need a final vote in the GOP-led Senate before it can be sent to Republican Gov. Kim Reynolds, who hasn’t said whether she’d sign it into law.

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If enacted, the legislation would almost certainly be challenged over whether it violates U.S. Supreme Court rulings.

Mississippi passed a law earlier this year that bans abortion after 15 weeks of pregnancy. That legislation is considered the nation’s most restrictive abortion law, but it’s on hold amid litigation.

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