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Speaker John Boehner "can’t imagine" his gay marriage views shifting | VIDEO

WASHINGTON -- Hours after Ohio Republican Sen. Rob Portman bucked his party and came out in support of gay marriage, House Speaker John Boehner (R-Ohio) reaffirmed his position against it in a wide-ranging exclusive interview with ABC News’ Martha Raddatz for “This Week with George Stephanopoulos,” that will air on Sunday.

Boehner told Raddatz that he could not envision a situation where his views would shift on same-sex marriage – even if one of his children came out as gay.

“Rob’s a great friend and a long-time ally. And I appreciate that he’s decided to change his views on this,” Boehner said. “I believe that marriage is the union of one man and one woman … 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.”

Portman, who Mitt Romney pondered tapping as a running mate in last year’s presidential election, changed his position on same-sex marriage after his son came out to him as gay. The Ohio senator is among a few, but growing number of prominent members of the GOP to express support for gay marriage.