Trump: My immigration policies would have prevented 9/11
© Greg Nash

Donald TrumpDonald TrumpIran claims U.S. to lift all oil sanctions but State Department says 'nothing is agreed' Ivanka Trump, Kushner distance themselves from Trump claims on election: CNN Overnight Defense: Joint Chiefs chairman clashes with GOP on critical race theory | House bill introduced to overhaul military justice system as sexual assault reform builds momentum MORE said his immigration policies would have prevented the Sept. 11, 2001, terrorist attacks from taking place.

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“I am extremely, extremely tough on illegal immigration. I am extremely tough on people coming into this country," Trump said on "Fox News Sunday." "I believe that if I were running things, I doubt that those people would have been in the country."

The Republican front-runner has made criticisms of former President George W. Bush, brother of GOP primary opponent Jeb Bush, a central part of his campaign strategy.

“I’m not blaming George Bush,” Trump said. “But I don’t want Jeb to say 'my brother kept us safe.' ”

“We lost 3,000 people, it as one of the greatest — probably the greatest catastrophe ever in this country,” Trump said.

Trump also took a shot at primary opponent Carly Fiorina’s stagnant poll numbers, after she briefly surged following the second primary debate.

“She’s going nowhere,” the businessman said. “You talk about dropping in the polls, she’s dropped like a rock.”

He also addressed his threat to pull out of the third primary debate if CNBC did not reduce the length of the program to two hours.

Trump said he “could stand there for 12 hours. I could stand there for 20 hours, but the people can’t take it.”

— This report was updated at 9:47 a.m.