Anti-abortion Democrats are firing back at members of their party’s platform committee for supporting language that would call for repealing a law preventing the use of federal funds for abortion.

The language inserted in the Reproductive Health section of the Democratic Party’s draft platform for the first time calls for the repeal of the Hyde Amendment, a pillar of the anti-abortion-rights movement.

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Sen. Bob Casey Robert (Bob) Patrick CaseySecond GOP senator to quarantine after exposure to coronavirus GAO report finds brokers offered false info on coverage for pre-existing conditions Catholic group launches .7M campaign against Biden targeting swing-state voters MORE Jr., a Democrat from Pennsylvania who opposes abortion, was concerned enough about the change to write a letter to the platform committee urging members to reconsider.

“This is a consensus-based policy that has, for many years, prohibited the use of federal funds to pay for abortion,” Casey wrote in a letter sent Friday to the platform committee and obtained by The Hill.

He said the Hyde Amendment recognizes “that many Americans remain morally opposed to abortion, and do not wish to see their tax dollars go to pay for abortion.”

The Hyde Amendment bans the use of federal funds to pay for abortions for Medicaid recipients except in cases of rape, incest or when pregnancy endangers the life of the mother.

Another anti-abortion Democrat, Sen. Joe Manchin Joseph (Joe) ManchinNames to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' MORE (W.Va.), has also criticized the proposed change.

“That's crazy,” Manchin told the Weekly Standard. “It's something that I know most of the Democrats in West Virginia and most West Virginians would not agree with. I don't either.”

The Hyde Amendment is attached annually to spending bills, and it has received bipartisan support since 1976 despite vocal opposition from a growing number of Democrats who say the law punishes poor women who want to exercise their right to have an abortion.

Representatives for two other prominent anti-abortion Democratic senators confirmed to The Hill on Monday that they were opposed to their party platform's proposal to repeal the Hyde Amendment.

“Senator Donnelly has long supported and continues to support the Hyde Amendment, and as a pro-life Senator believes all life is sacred,” said Sarah Rothschild, spokeswoman for Sen. Joe Donnelly Joseph (Joe) Simon DonnellyNames to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day Barrett seen as a front-runner for Trump Supreme Court pick MORE (D-Ind.).

North Dakota Sen. Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE is another Democrat who disagrees with the proposed platform language.

“Senator Heitkamp has always been someone who puts the priorities of North Dakotans before any sort of political platform. She has long said she believes reproductive decisions should be left to a woman, her family, and her doctor,” said a spokeswoman.

“She also supports the Hyde amendment and a state’s right to mandate parental consent for minors or restrict partial birth abortions, except when medically necessary to protect the life of the woman.”

The office of another anti-abortion Democratic senator, Tim Kaine Timothy (Tim) Michael KaineNames to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick Biden promises Democratic senators help in battleground states MORE of Virginia, did not respond to The Hill's questions.

Kaine is under consideration to become Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE's vice presidential pick, and some within the party view his personal opposition to abortion as a barrier to that.

Earlier on Monday, the Susan B. Anthony List, a socially conservative group, issued a statement challenging anti-abortion Democrats to oppose the Hyde-related language in the platform.

The group's president, Marjorie Dannenfelser, will give a speech at Washington's National Press Club on Wednesday which will include an attack on “Democrat abortion extremism.”

“The 2016 platform is dramatically out of step with the position previously taken by several Democratic senators, including Tim Kaine, currently being considered as Hillary Clinton's running mate,” Dannenfelser said.