Bill Donohue, president of the Catholic League, argued that marriage is not about love during an appearance Thursday on CNN.

Donohue told New Day host Chris Cuomo that he's opposed to gay marriage in part because marriage is not about love.

“The gold standard is a father and a mother creating a family,” Donohue said. “That's what was ordained by nature and nature's god.”

“Marriage was not ordained by nature,” Cuomo replied. “Most mammals don't couple.”

“Marriage is about love, commitment and the right to it is about equality,” Cuomo added.

“No it isn't. Marriage is about family. It's not about love,” Donohue responded. “Two sisters can love each other. … That's an odd idea, by the way, in Western history. The idea that two people should get married on the basis of love. Marriage has always been based historically on duty and on commitment.” (The video is embedded on this page. Visit our video library for more videos.)