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Newt Gingrich says that Hillary Clinton is running a "gutter campaign," but Donald Trump must take the high road and stay on message.

"When you run for president, everything is fair game," Gingrich said. "The question is: Is it the right thing to be doing to elect Donald Trump?"

He said that Clinton has a reasonable chance of winning if they keep the campaign "down in the gutter."

He added that "nobody has been better at being in the mud" than the Clintons.

"If it’s he said-she said ... and it’s a personality thing, she has a fair chance of winning," Gingrich said. "She has a zero chance of winning if Trump can discipline himself and run this at a very high level."

He explained that Clinton is a lawyer and professional politician who has "practiced being glib" for decades.

"If you want a glibness test, Trump will never beat her. This is what she does well - she does words. Now, what he does is actually builds buildings, he actually builds companies, he actually creates jobs."

Watch the "Hannity" interview in the clips above and below.

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