Oklahoma Gov. Kevin Stitt (R) signed a bill Tuesday that bans virtually all abortions after six weeks of pregnancy, threatening to sharply curtail abortion access for both Oklahomans and Texans who have traveled to Oklahoma since their state passed a similar ban last year—a move that comes as the Supreme Court appears poised to overturn abortion rights nationwide.

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Stitt announced that he signed the law—known as the Oklahoma Heartbeat Act, or SB1503—in a Tuesday afternoon tweet, after the State House passed it on Thursday and the state Senate passed it in March.

The law prohibits abortions if a physician can detect a “fetal heartbeat,” which typically takes place after around six weeks of pregnancy, with exceptions for medical emergencies but not for pregnancies following rape or incest.

This ban is enforced by allowing private citizens to file civil lawsuits against anybody who “aids or abets” an abortion, not including women who receive the procedure—an unusual enforcement structure almost identical to Texas’ six-week abortion ban, which courts have so far repeatedly declined to overturn.

Last month, Stitt also signed into law a near-total abortion ban that would make performing an abortion a felony, but that law doesn’t take effect until August.