More than 200 Democratic lawmakers from the House and Senate are warning the Trump administration against making changes to a federal family planning program for low-income Americans.

Anti-abortion groups and Republicans have urged the administration to bring back Reagan-era regulations that banned organizations receiving Title X funding from promoting or referring patients for abortions. It would also require funding recipients have a physical and financial separation from abortion facilities.

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In separate letters sent to Health and Human Services Secretary Alex Azar Tuesday, Democrats argue these restrictions would be harmful for patients, especially those who go to Planned Parenthood.

"Calls to reinstate these policies directly acknowledge this effort as an opportunity for President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE to fulfill his pledge to 'defund Planned Parenthood,' whose health centers remain an essential part of the family planning safety net, serving 40 percent of Title X patients," wrote 45 Senate Democrats, led by Sens. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (Mass.), Patty Murray Patricia (Patty) Lynn MurraySenate Democrats introduce legislation to probe politicization of pandemic response Trump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency MORE (Wash.) and Maggie Hassan Margaret (Maggie) HassanDemocrats step up hardball tactics as Supreme Court fight heats up Congress needs to prioritize government digital service delivery Senate Democrats demand answers on migrant child trafficking during pandemic MORE (N.H.)

Other Title X providers would not be able to absorb the patients who would lose access to care through Planned Parenthood, the House Democrats agreed.

A ban on abortion referrals would "reverse progress made in critical areas," including the declining unintended pregnancy rates in the U.S.

"We strongly oppose efforts to undermine the integrity of the Title X program and harm the millions of people who rely on it for care," wrote 166 House Democrats, led by Reps. Joseph Crowley (N.Y.) and Barbara Lee Barbara Jean LeeOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats call for investigation into Pentagon redirecting COVID-19 funds Steph, Ayesha Curry to be recognized by the Congressional Hunger Center MORE (Calif.)

Anti-abortion groups and Republicans expect the administration to issue the regulations as a way to chip away at federal funding for Planned Parenthood.

While federal law prevents the use of taxpayer dollars for abortions, anti-abortion advocates argue that money is fungible and can still indirectly support abortions.

"The result of this policy is simply to separate the Title X network of family planning providers from abortionists like Planned Parenthood — the nation's largest abortion chain," the Susan B. Anthony List and other anti-abortion groups wrote in a letter to Azar earlier this month.

"For far too long the Title X Family Planning Program has been integrated with abortion centers. It is time to act swiftly to disentangle abortion centers from the Title X network."

Notably absent from the Senate letter were three vulnerable Democrats up for reelection: Sens. Joe Donnelly Joseph (Joe) Simon DonnellyTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day MORE (Ind.), 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 (N.D.) and Joe Manchin Joseph (Joe) ManchinThe Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (W.Va.). Sen. Doug Jones (Ala.) also did not sign on.