The Republican presidential candidate Ben Carson said Sunday that he believed that abortion should be outlawed even in cases of rape and incest, comparing the procedure with slavery.

“I would not be in favor of killing a baby because the baby came about in that way,” Mr. Carson said on NBC’s “Meet the Press,” citing “the many stories of people who have led very useful lives who were the result of rape or incest.”

Mr. Carson, who has not been shy about using slavery and Nazi metaphors, held up what he said was a historic parallel with abortion.

“During slavery, a lot of the slave owners thought that they had the right to do whatever they wanted to that slave,” said Mr. Carson, a former brain surgeon. “Anything that they chose to do. And, you know, what if the abolitionist had said, you know, ‘I don’t believe in slavery. I think it’s wrong. But you guys do whatever you want to do.’ Where would we be?”

Surveys of Republican voters in Iowa, where Mr. Carson has staked out a lead, indicate that such language does little to hurt him there.

Read the article “Ben Carson Calls for Overturning Roe, Compares Abortion to Slavery” on nytimes.com.