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Pat Buchanan is warning that the Republican Party will lose credibility in the people's eyes if it tries to deny Donald Trump the nomination.

"To either ignore the clear instructions of its electorate, or renounce their chosen messenger, would be for the Republican Party to forfeit its future, and cling to a discredited and dead past," Buchanan wrote in a recent op-ed.

Tonight on "Hannity," he said that if Cruz and Kasich take the nomination by "pilfering and poaching the'll be like the heavyweight champ standing there with the gloves over his head, and the award going to the guy lying on the canvas."

He noted that Cruz has a better ground game than Trump and knows how to work the rules better than the GOP frontrunner -- but that doesn't change the perception that Trump is the clear choice of the electorate.

"The American people have perceived a tremendously exciting, interested contest, and the reality is that Donald Trump won it, and everybody knows it."

He pointed to Trump's big victory in New York last night.

"Are people gonna turn around and say, now they're gonna give it to the guy who was runner-up by 300 delegates? Why?"

Watch the interview above.

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