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Syndicated columnist Charles Krauthammer discussed the second presidential debate on The O'Reilly Factor on Monday.

Krauthammer said Trump's "high point" in the forum was the exchange he said "referenced...the Lloyd Bentsen line"-- when Donald Trump criticized Hillary Clinton for citing Abraham Lincoln in her defense of something she said in her Wall Street speeches.

"It was extremely effective and appeared spontaneous."

In the 1988 election, Democratic vice presidential nominee Sen. Lloyd Bentsen (D-Texas) admonished Sen. Dan Quayle (R-Ind.) for referencing John F. Kennedy in a response.

"I knew Jack Kennedy...and you are no Jack Kennedy," Bentsen said at the time.

Krauthammer said Trump's low point was his threat to seek prosecution of Clinton over what he perceived to be an ineffective investigation into her handling of classified information.

"That's 'banana republic'," Krauthammer said, "We have had 250 years of miraculous transfer of power--in other countries your life can be on the line in elections. The breach of that etiquette...is something that should never be done."

O'Reilly disagreed, saying that Trump may have the power to follow through on seeking legal action in an "investigation [he] deemed not credible."

Krauthammer pointed to Gerald Ford's treatment of Richard Nixon as a counterpoint.

Watch the full clip above and let us know what you think in the comments.

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