Ben Carson says he believes the acceptance of same-sex marriage could to lead to the definition of marriage changing to allow more than two partners and said more changes could follow.

Carson also told radio host Eric Metaxes on Friday that he'd "yet to hear," what position a person who believes in traditional marriage but "has nothing against gay people" could take that is acceptable to gay people.

"The other thing you have to recognize and this is a very important issue," said Carson. "If you change the definition of marriage for one group what defense do you have for the next group that comes along and wants it changed. Can you say, 'no we're just changing it this one time and it will this way for forever.' Well, how is that fair? I mean, it doesn't make any sense."

When Metaxes said allowing same-sex marriage would open up debate on the idea that marriage has to between two people, Carson said, "That's the natural next question and on it goes from there."

Carson said allowing same-sex marriage would mean the "word of God" would be changed on other things besides marriage too.

"Effectively what it does is it takes away from the tradition of family that we've known for thousands of years but also it negates an important part of the word of God," said Carson. "If you can do that with one part of the word of God you can do with the rest of it too. Toss the whole thing in the garbage."