The Republican National Committee panel has upheld a pro-life platform adopted in 2008.
The 110-member panel passed the Human Life Amendment Tuesday in Tampa, Fla., where the RNC will hold hits convention next week.
It calls for a constitutional amendment outlawing abortion without specific exceptions for rape or incest. It is the very policy Missouri Senate Candidate Todd Akin was defending when he made the "legitimate rape" comment.
Romney has condemned Akin for his statement that aligned with the party's platform. He said Tuesday that he agreed with former Missouri Sens. John Ashcroft, Kit Bond, John Danforth, and Jim Talent who have called for Akin to quit the race.
The platform read "Faithful to the 'self-evident' truths enshrined in the Declaration of Independence, we assert the sanctity of human life and affirm that the unborn child has a fundamental individual right to life which cannot be infringed."
"We support a human life amendment to the Constitution and endorse legislation to make clear that the Fourteenth Amendment's protections apply to unborn children."
GOP lawmakers endorsed the platform even though it is at odds with Republican presidential candidate Mitt Romney's stance, which supports exceptions in cases of rape.
Massachusetts Sen. Scott Brown, who is running in a tight reelection race, responded to the decision with a letter urging the RNC to adopt a more accommodating position.
"I believe this is a mistake because it fails to recognize the views of pro-choice Republicans like myself," he said.
He went on to tell the party Chairman Reince Preibus "even while I am pro-choice, I respect those who have a different opinion on this very difficult and sensitive issue. Our party platform should make the same concession to those of us who believe in a woman's right to choose."
The platform will come up for a vote of the convention delegates on Monday.