Story highlights Donald Trump claimed Sunday that the 9/11 attacks wouldn't have happened on his watch

Trump again attacked Jeb Bush over his brother's record on security

Washington (CNN) Donald Trump says he's not blaming George W. Bush for 9/11, but he claims that if he'd been president, the attacks never would have happened.

In an appearance on "Fox News Sunday," the real estate mogul said that since he's "extremely, extremely tough on immigration" the attackers wouldn't have been in position to commandeer U.S. flights.

"So there's a good chance that those people would not have been in our country," Trump said.

He took another shot at Jeb Bush for claiming that Bush's brother, the 43rd president, kept the nation safe.

"I'm not blaming George Bush," Trump said. "But I don't want Jeb Bush to say, 'My brother kept us safe,' because September 11 was one of the worst days in the history of this country."

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