Franklin Graham, the son of evangelist Billy Graham, believes President Barack Obama is on the outs with Christians for his endorsement of gay marriage.

In an appearance on CNN's Piers Morgan Tonight, Graham told host Piers Morgan that support for Obama was fatering among religious groups due to his May endorsement.

“God instituted marriage. And for the president to now back something that is against God's position and is a big problem for him with not only evangelical churches but African-American churches across this country, who are very conservative on this issue,” he said.

After stating that gay people “can do whatever they want,” Graham made it clear that did not include tying the knot.

“Marriage is between a man and a woman. God is the one who defines the limits for marriage. He's the one who gave marriage ...”

“I cannot accept gay marriage. I'm not homophobic. I'm not against gay or lesbian people. They are free to live however they want to live, but I believe God makes it very clear that marriage is between a man and a woman. And there is no discussion about it.” (The video is embedded on this page. Visit our video library for more videos.)