Former Republican presidential nominee Mitt Romney reiterated his opposition to marriage equality on Sunday, saying it will “take a long, long time” to determine whether the advancement of same-sex marriage will have an impact the way children are raised.

Romney, who lost the election to President Obama in 2012, when asked by host David Gregory on NBC’s “Meet the Press” in an appearance to discuss the 2014 Winter Olympics whether the legalization of same-sex marriage throughout the country has had a negative impact on society.

Gregory pointed to a 2004 op-ed that Romney wrote for the Wall Street Journal in opposition to same-sex marriage, titled, “A Citizen’s Guide to Protecting Marriage.” Romney wrote it nearly ten years ago while governor of Massachusetts after the State Supreme Court legalized marriage equality, making the Bay State the first in the country to afford marriage rights to gay couples.

At first, Romney dodged in his response to Gregory’s question on whether he has found negative impact of same-sex marriage since that time, reiterating his previously stated talking points that he believes marriage should be limited to one man, one woman.

“Well, I think marriage is a relationship between a man and a woman, and I think the ideal setting for raising a child is in a setting where there’s a father and a mother,” Romney said. “Now there are many other different settings that children are raised in, and people have the right to live their life as they want to, but I think marriage should be defined in the way that it has been defined for several thousand years, and if gay couples want to live together, why that’s fine as well. That’s their right.”

But when Gregory pressed Romney to evaluate whether marriage equality has had a negative impact, the former Massachusetts governor said it’s too soon to tell and it may take “generations” before the consequences are known.

“I think it’s going to take a long, long time to determine whether having a gay marriage make it less likely for kids to be raised in settings where there’s a mom and a dad,” Romney said. “That’s not going to happen overnight. It’s something which happens over generations, in fact. Again, I think the ideal setting is whether there’s a mom and a dad that can invest their time and their resources in supporting the development of a child.”

Despite Ronmey’s concerns, major psychological and family groups have disputed the notion that gay parents aren’t as fit as straight parents in raising children. Last year, the American Academy of Pediatrics came out in support of same-sex marriage.

Romney also refused under further questioning to characterize the issue of same-sex marriage as an Republicans have lost, saying it’s playing out across the country.

“I think, in this case, it continues to be an issue that people find relevant and important, and it’s something which is being considered in various states across the country,” Romney said.

Following numerous court rulings in favor of marriage equality and expectations the issue once again reach the U.S. Supreme Court, the former Republican presidential contender added he believes the issue of marriage equality should be decided by the people, not judges.

“I do believe, by the way, that it’s best decided by the people, rather than by the courts,” Romney said. “I think when the courts step in and make a decision of this nature, they’re removing from the people something which they have the right to decide themselves.”

In 2012, Romney campaigned not only in opposition to same-sex marriage, but signed a pledge with the anti-gay National Organization for Marriage to support a U.S. constitutional amendment that would ban gay nuptials throughout the country and defend the Defense of Marriage Act in court.

David Gregory: Lemme talk to you about politics, and of course, the issue of gay rights around the world, particularly in Russia, has been part of the backdrop of these games, and you think about the issue of same-sex marriage in America. Ten years ago, almost to the month, it was Massachusetts when you were governor that really set same-sex marriage rights into motion.

You wrote about it at the time rather pointedly, where you said, after that decision by the court, “The definition of marriage is not a matter of semantics. It will have lasting impact on society.” Ten years later, as you’ve seen same-sex marriage now in 17 states and the District of Columbia, has it had a negative impact on society in your judgement?

Mitt Romney: Well, I think marriage is a relationship between a man and a woman, and I think the ideal setting for raising a child is in a setting where there’s a father and a mother. Now there are many other different settings that children are raised in, and people have the right to live their life as they want to, but I think marriage should be defined in the way that it has been defined for several thousand years, and if gay couples want to live together, why that’s fine as well. That’s their right.

Gregory: But lemme just follow up, do you think it’s actually had a negative impact on society that you have so many states now recognizing it?

Romney: Oh, I think it’s going to take a long, long time to determine whether having a gay marriage make it less likely for kids to be raised in settings where there’s a mom and a dad. That’s not going to happen overnight. It’s something which happens over generations, in fact. Again, I think the ideal setting is whether there’s a mom and a dad that can invest their time and their resources in supporting the development of a child.

Gregory: As you look at the progression of this issue, as a Republican do you think Republicans have lost the fight politically over this?

Romney: I don’t know that you have to worry about who wins and who loses a particular fight. I think if you stand for various principles, you communicate those to the American people, and they either support those or not. Sometimes, if something is lost, why, you move on to the next issue. You wish you would have won that one, but you move on. I think, in this case, it continues to be an issue that people find relevant and important, and it’s something which is being considered in various states across the country.

I do believe, by the way, that it’s best decided by the people, rather than by the courts. I think when the courts step in and make a decision of this nature, they’re removing from the people something which they have the right to decide themselves.