To widespread outcry, a procedural vote on a GOP effort to slash funding for the Title X family planning program, which funds clinics that largely serve poor women and women of color, passed the Senate Thursday after Vice President Mike Pence was forced to cast a tie-breaking vote.

The measure repeals an Obama-era rule that blocks states from defunding healthcare providers for political reasons. The Republican-led effort appeared designed to target Planned Parenthood clinics, which receive funds under Title X.

“The Title X family planning program is a vital source of family planning and related preventive care for low-income, uninsured, and young people across the country,” wrote the Leadership Conference for Civil and Human Rights in an open letter to Sens. Mitch McConnell (R-Ky.) and Chuck Schumer (D-N.Y.).

“Every year, more than four million individuals access life-saving care such as birth control, cancer screenings, and testing for sexually transmitted infections (STIs) including HIV at Title X-funded health centers,” the advocacy group observed. “Seventy-five percent of Planned Parenthood patients are at or below 150 percent of the federal poverty level and half of their health centers are located in rural or underserved areas. People of color comprise forty percent of Planned Parenthood patients.”

“For decades, the Title X Family Planning Program has been a lifeline for women, helping them to have healthier families and lead healthier lives,” wrote the Center for American Progress’ (CAP) Kiersten Gillette-Pierce and Jamila Taylor.

The Title X amendment to the Public Health Service Act was signed into law by President Richard Nixon in 1970, and “it is the only federal domestic program focused solely on providing people with critical reproductive health services related to family planning and contraception, including physical exams, prescriptions, laboratory exams, contraceptive supplies, and referrals when medically needed,” Gillette-Pierce and Taylor noted.

Democratic senators testified passionately against the attempt to cut Title X funding: