Stewart's spinoff has "struggled mightily" against ABC's hit series "Lost," Trump said, but he refused to predict what may happen to Stewart's spinoff down the line.
"That's really up to (producer) Mark Burnett and myself and NBC," he said.
Trump said shooting is already under way for a fifth season of his show.
"It'll be very interesting," he said. "I think it's a very good show."
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