Republican presidential candidate Jeb Bush said Sunday that his brother, former President George W. Bush, should not blamed for the Sept. 11, 2001, terrorist attacks.

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"Look, my brother responded to a crisis, and he did it as you would hope a president would do," Bush said of his older brother during an interview on CNN's "State of the Union."

"He united the country," Bush continued. "He organized our country, and he kept us safe. And there's no denying that. The great majority of Americans believe that."

Bush was responding to criticism about his older brother's foreign policy record from Republican presidential front-runner Donald TrumpDonald John TrumpBill Kristol resurfaces video of Pence calling Obama executive action on immigration a 'profound mistake' ACLU says planned national emergency declaration is 'clear abuse of presidential power' O'Rourke says he'd 'absolutely' take down border wall near El Paso if he could MORE.

He said Trump is trying to score political points by talking about the Sept. 11 attacks that were a touchstone in his older brother's presidency.

"I don't know why he keeps bringing this up," Bush said of Trump's 9/11 criticism. "It does show that he's not a serious person as it relates to being commander in chief and being the architect of a foreign policy.

"Across the spectrum of foreign policy, Mr. Trump talks about things as though he's still on 'The Apprentice,' " Bush continued. "I mean, literally, talking about Syria, saying ISIS should take out Assad, then Russia should take out ISIS, as though it was some kind of board game, and not a serious approach.

"This is just another example of the lack of seriousness," Bush said. "And this is a serious time. We're under grave threats again, and I think we need a president with a steady hand."

Trump took to Twitter on Sunday morning, asking if the former president had "bad info" for attacking Iraq.

— This report was updated at 10:06 a.m.