More than 50 anti-abortion groups are calling on Congress to amend an ObamaCare stabilization bill to ensure that federal funding doesn't go to plans that cover abortions.

Led by the Susan B. Anthony List, the groups are pressuring lawmakers to vote against the bill, sponsored by Sens. Lamar Alexander Andrew (Lamar) Lamar AlexanderPence meeting with Senate GOP ahead of vote to block emergency declaration Addressing repair backlog at national parks can give Congress a big win The Hill's Morning Report — Emergency declaration to test GOP loyalty to Trump MORE (R-Tenn.) and Patty Murray Patricia (Patty) Lynn MurrayThis week: Congress, Trump set for showdown on emergency declaration Senate reignites blue slip war over Trump court picks Johnson & Johnson subpoenaed by DOJ and SEC, company says MORE (D-Wash.), that would reimburse insurance companies for giving discounted deductibles and copays to low-income customers.

These subsides are called cost-sharing reductions, and ObamaCare already states that this funding can't go toward plans that cover abortions.

But anti-abortion groups have long argued the existing language isn't strong enough and are asking that the bill be changed to include the Hyde amendment, which bans federal funding from covering abortions.

The Hyde amendment covers Medicaid and other programs under the Department of Health and Human Services.

"Any Member voting for the Alexander-Murray proposal, or other Obamacare stabilization legislation not covered by the Hyde amendment, would not only be voting to sustain what many have called the largest expansion of abortion since Roe v. Wade, but would also be voting to directly appropriate taxpayer dollars for insurance that includes elective abortion," the groups wrote in a letter to lawmakers Tuesday.

The groups said they would also oppose any spending package that includes the bill if it isn't amended to include Hyde protections.

It's widely expected that the Senate will include the ObamaCare stabilization bill in a funding package that will be needed to avoid a government shutdown on Saturday.

The anti-abortion groups also warned against voting for another health-care bill expected to be included in the package.

That bill, authored by Sens. Susan Collins Susan Margaret CollinsHouse to push back at Trump on border Hillicon Valley: Senators urge Trump to bar Huawei products from electric grid | Ex-security officials condemn Trump emergency declaration | New malicious cyber tool found | Facebook faces questions on treatment of moderators GOP Sen. Tillis to vote for resolution blocking Trump's emergency declaration MORE (R-Maine) and Bill Nelson Clarence (Bill) William Nelson2020 party politics in Puerto Rico There is no winning without Latinos as part of your coalition Dem 2020 candidates court Puerto Rico as long nomination contest looms MORE (D-Fla.) would provide states billions of dollars to help insurers with the costs of covering high-risk, expensive patients.

This bill isn't covered by the Hyde amendment.

The letter puts pressure on Republicans in the House who might be supportive of the ObamaCare bills but would typically be wary of going against the anti-abortion groups.

Democrats, however, would likely oppose these changes, arguing they would further restrict access to abortion.

With a slim Republican majority in the Senate, Democratic support is needed to pass any spending bill there.