House Speaker John Boehner (R-Ohio) said in an interview broadcast Sunday that he can't imagine his views on same-sex marriage ever changing.

"I believe that marriage is the union of one man and one woman," Boehner said on ABC News's "This Week With George Stephanopoulos." "It's -- it's what I grew up with. It's what I believe. It's what my church teaches me. And -- I can't imagine that position would ever change."

Guest host Martha Raddatz asked Boehner about Sen. Rob Portman (R-Ohio), who last week announced that he now supports gay marriage, following his son's revelation that he is gay. Boehner said that he appreciates Portman's decision, but reiterated that he takes a different view.

"Listen, Rob's a great friend and a long-time ally.  And -- I appreciate that he's decided to change -- his views on this.  But I believe that marriage is a union of -- of a man and a woman, said Boehner.