Planned Parenthood, an NGO that receives federal money, is under sustained attack from congressional Republicans, some of whom want to defund it on grounds that the government should not be paying for abortions.
Conservative critics, many of whom seek to outlaw abortion in the United States, have accused the organization of selling fetal organs and body parts for profit, and encouraging women to have abortions in order to expand such operations.
"Using fetal tissue in lifesaving medical research is legal," and fewer than one percent of Planned Parenthood health centers facilitate the donation of such tissue for research, she added.
"Donating fetal tissue is something many of our patients want to do, and regularly request."
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The activists, releasing edited footage from hours of recordings, accuse the officials of discussing a change of protocol to preserve intact certain organs, which would be illegal.
But Planned Parenthood strongly denounced their accusers, insisting that the only money discussed in the video was the legal compensation for transportation, administrative and other costs incurred.
"The outrageous accusations leveled against Planned Parenthood, based on heavily doctored videos, are offensive and categorically untrue," Richards said.
Planned Parenthood operates nearly 700 health centers nationwide, providing birth control, cancer screenings, and testing and treatment for sexually transmitted infections.