Santorum said that the promise of embryonic stem cell research had been vastly overstated, explaining, "There's all sorts of information out there that this is research that very well may not ever end up to be helpful therapeutically."

The Pennsylvania Republican said he was especially disappointed over the Frist move because the two had been working on other, less controversial proposals.

"We've seen over the last six months a whole bunch of scientific theories come forward as to how to get embryonic stem cells without destroying a human embryo," Santorum explained.

"I've been working on a bill with Sen. Frist ... to try to put forward a funding proposal for the [National Institutes of Health] to look at alternative ways to get these embryonic stem cells, without creating a human embryo and without killing that embryo to get the cells."

"There's four or five different technologies that are potentially viable to get these cells," Santorum said, adding, "I don't think we need to go down this path."

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