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With the first presidential debate of the general election less than 20 days away, Newt Gingrich gave some insight into Donald Trump's preparations.

"Trump is a little bit like Babe Ruth. He's like one of those great natural athletes who doesn't do all that well in practice. But some extra adrenaline hits..."

Brit Hume asked if Trump has been practicing at all.

"I think he practices all the time but not the way normal people do," Gingrich responded, saying that Trump regularly consults with people in brief, but concentrated intervals.

"So what you get is this constant thinking about it," he said.

Gingrich said that if Trump gets too mired in specificity and details, it won't be helpful. "If the debate gets down into who is the president of Gambia, he's gonna lose," he said. 

"I think the worst thing you could do to Donald Trump is try to figure out a way in 20 days to fill his brain with enough details that he could sound like a good graduate student. The best thing is you can do is give him the confidence. He is so much faster than she is."

Gingrich noted that Trump held his own in the Republican debates among several capable opponents. Hume remarked that Trump's tactic there was to turn them into a sort of "personal brawl."

To that, Gingrich replied: "What do you think he's going to do with this one?"

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