Abortion advocates are on the verge of forcing Illinois’ pro-life medical professionals, pharmacists and crisis pregnancy center volunteers to refer women for abortions and birth control, in violation of what opponents say is a constitutional right to religious liberty.

Last week, Illinois legislators sent Senate Bill 1564 to Governor Bruce Rauner for his signature. The pro-abortion Republican has been under pressure from both sides of the debate to sign the measure, which the ACLU has praised — but religious groups have long stood against.

“This Amendment takes away the rights of Illinois women to be treated by a pro-life doctor, because it would force medical facilities and physicians who conscientiously object to performing abortions (and other procedures) to refer for, make arrangements for someone else to perform, or arrange referral information that lists willing providers, for abortions,” said Alliance Defending Freedom Senior Legal Counsel Matt Bowman.

“By violating the pro-life principles of pro-life physicians and medical organizations, the Amendment would deprive Illinois women of their choice of a medical provider that does not refer or arrange for abortions in any way.”

According to Pregnancy Help News, SB 1564 requires medical providers to do one of three things if they oppose abortion or birth control. They must “refer the patient” to someone else, “transfer the patient” to someone else or provide a list of “other health care providers who they reasonably believe may offer the health care service.”

The ACLU backs the bill, saying in a statement on Friday that “the Illinois House passed a bill that protects all patients, including women, ensuring they at the very least will have complete information about their health condition, rather than being sent home and denied information based on the hospital’s religious beliefs…”

While the ACLU framed its support as part of its fight to force Catholic hospitals to engage in practices opposed on moral grounds by the U.S. Conference of Catholic Bishops, it has been opposed on moral and constitutional grounds by pro-life clinics, Catholics and others around the state. Pregnancy Help News said that co-signers of a letter drafted by Bowman to Rauner included pro-life pregnancy care center groups Heartbeat International and Care Net, as well as American Association of Pro-Life Obstetricians and Gynecologists, six Illinois physicians and 11 Illinois pregnancy medical centers.

Four of the physicians are OB-GYNs.

The pressure on Rauner comes as a similar bill was introduced in Michigan, and as a battle by pro-life groups against an existing law in California heats up in advance of a June 14 hearing on the constitutionality of California’s Reproductive FACT Act, a law that requires pro-life clinics to post where women can get abortions, as well as provide direct referrals.