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Jeb Bush won’t commit to campaigning with George W. Bush

WASHINGTON, IOWA - JUNE 17: Jeb Bush, former governor of Florida and Republican 2016 U.S. presidential candidate, speaks during a campaign stop outside a residence in Washington, Iowa on Wednesday, June 17, 2015. (Photos by Charles Ommanney/The Washington Post)

PELLA, Iowa -- Jeb Bush won't commit to campaigning alongside his brother, former president George W. Bush. At least not yet.

"He's been helpful already," Jeb Bush said of his older brother when asked by ABC News anchor David Muir in an interview taped here on Wednesday afternoon.

"He's helped -- in gatherings where it wasn't inconvenient for him. And I -- sure I'd love to have his help. But -- by the way -- the last time I saw my brother's approval rating, or favorability rating, it's higher than that of President Obama's. He's -- he's had a pretty good post-presidency."

When Muir pressed Bush on the potential involvement of his brother, he said: "I don't know. I don't know, we just started. But -- I'm -- I'm -- I'm-- you know, I'm George's brother, I love him. I know for me to be successful, this has to be about my ideas and about my life experience and about the future."

A transcript of the interview was provided by ABC News in advance of it airing Wednesday evening on "ABC World News Tonight," "Nightline" and tomorrow on "Good Morning America."

As he has in other recent television interviews, Jeb Bush conceded it has been difficult to seek distance with his family's political past.

"When you love someone as your brother or your dad, it's not easy for me to say, just kinda throw them under the bus to make myself look better," he said. "I just can't do it."