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Sorry I ran into news from today saying how wonderful stem cells were and cured polio so I had to look. Second link refutes necessity.

http://www.msnbc.com/rachel-maddow-show/cruz-accidentally-gives-away-the-game
As msnbc’s Emma Margolin reported yesterday, Cruz also intends to “prosecute” the health care organization over fetal-tissue research.

“For a century, Americans have helped heal and care for millions in need. Our values propelled extraordinary innovation. America made the world better,” states a narrator in the 30-second spot. “So how did America become a country that harvests organs from unborn children? And who has the courage to stop it?”

“Ted Cruz will prosecute and defund Planned Parenthood,” the narrator continues. “Help Cruz restore American values.”

https://www.lozierinstitute.org/history-of-fetal-tissue-research-and-transplants/
Vaccine development: Early attempts at growing viruses used cultures of mixed human fetal tissue, not individual cells, e.g., for growth of poliovirus, 1949.[18] Later, poliovirus was produced in human fetal cell lines (WI-38, 1961,[19] fetal female lung; MRC-5, 1966, [20]fetal male lung). Now most manufacturers of polio vaccine use other cell types including monkey cells, and most do not use fetal cells.

The first individual human cell (not tissue) grown in the lab was a tumor cell in 1951,[21] because the growth character of cancerous cells made them easiest to grow. In the 1960’s and 1970’s, cell culture work operated under an assumption that younger cells were better, grew faster, lived longer, so fetal cells obtained from abortion were used. These cells adapted to lab culture and continued to grow, becoming known as a “cell line” because they developed as a lineage from different, specific cells grown in the lab. A few human fetal cell lines (WI-38, MRC-5) are still in use for some vaccine production.[22] However, newer cell lines and better culture techniques make this reliance on fetal cells an antiquated science. In addition, the CDC and other leading medical authorities have noted that “No new fetal tissue is needed to produce cell lines to make these vaccines, now or in the future.”[23]

A clear example of the lack of necessity for further fetal tissue is development of the new vaccine — rVSV-ZEBOV — against Ebola virus. The successful results of the field trial, published July 31, 2015, were very welcome in the fight against this deadly disease.[24] This successful Ebola vaccine was not developed using fetal tissue or fetal cell lines, but rather with Vero, a monkey cell line, demonstrating again that medical science has moved beyond any need for fetal tissue in useful medical research.[25]