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Attacking Trump may be theme of second 2016 Republican debate, experts say

"He's like a professional wrestler," said Julian Zelizer, a political science professor at Princeton University. "He likes to be the center of controversy — it's a strategy he has. And it's worked very well. He's goading people into attacking him. He knows that's what people like to see.

"The candidates can't get out of this cycle at this point," Zelizer added.