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Charles Krauthammer says Donald Trump can hold his own against Hillary Clinton in Sunday's presidential debate, but he must not fall into the same trap he fell into after the first debate.

Krauthammer noted that during the first debate Clinton mentioned Trump's alleged comments about former Miss Universe Alicia Machado's weight gain.

That started a feud between the the Republican nominee and the former beauty queen that dominated headlines for several days.

"He just needs to ... ignore the bait," Krauthammer said. "He should just dismiss all the quotations that he hears, the way that Pence did. Deny it ever happened and then ignore the fact-checkers the next day."

He suggested that Trump do more debate preparation and practice pivoting back to Clinton's many weaknesses, such as Benghazi, her emails or the Clinton Foundation.

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