An angry Rick Santorum lashed out at New York Times reporter Jeff Zeleny after a campaign rally in Wisconsin Sunday evening, calling the paper’s story on him “bullshit.”

The former Pennsylvania senator’s temper was fueled when Zelany asked him for clarification about a line attacking Mitt Romney in his speech.

“You said Mitt Romney was the worst Republican in the country, is that true?” Zelany said.

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“What speech did you listen too?” Santorum replied. “Stop lying! I said he is the worst Republican to run on the issue of Obamacare. And that’s what I’m talking about. I said uniquely for every speech I give, I’ve said he’s uniquely disqualified to run against Barack Obama on the issue of healthcare. Would you guys quit distorting what I said?”

Santorum added: “Quit distorting my words. If I see it, it’s bullshit! Come on man, what are you doing?”

The Louisiana Primary winner later released an email to his supporters, telling them “he was aggressively attacked by a New York Times reporter” but that he “didn’t back down” nor “let him bully me.”

Santorum continued to praise his actions in an interview on Fox News Monday morning.

“If you haven’t cursed out a New York Times reporter during the course of a campaign, you’re not really a real Republican is the way I look at it,” he said.

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WATCH: Video from CBS News, from March 25, 2012.