MSNBC's Chris Hayes clashed with former New York Mayor Rudy Giuliani after Wednesday night's presidential debate.

Giuliani appeared on the program live from Denver and praised Republican presidential candidate Mitt Romney's debate performance.

Hayes asked the former mayor about Romney's position on the Bush-era tax cuts.

"Am I still correct that the Romney campaign's official position is they want to extend, indefinitely or permanently, the Bush tax cuts on the table, which would of course cut taxes for high income individuals. I don't even think that's a matter of debate, and yet Mitt Romney, himself, tonight seemed to repudiate that," Hayes said.

"Whoa, whoa, wait," Giuliani said. "If you extend the Bush tax cuts, you don't cut taxes, you keep taxes where they are. If you don't extend the Bush tax cuts, you raise taxes."

"No, they're set to expire," Hayes said. "It was your party that set them to expire, I would add. Sitting here at this desk, I didn't do that."

Giuliani described how the Bush tax cuts impact his personal taxes would and said that he would receive a big tax increase if they expired.

"Right, because you make a lot of money! That's exactly my point!" Hayes said. "Mr. Giuliani, you are one of those people who are going to see a very large tax cut, because you are, to your great credit, a high-earning individual. And of course you will see a high bounty from this tax cut. That's the question on the table."

Giuliani told Hayes to "stop the ad personam silliness." He added, "Will you let me finish my answer rather than yelling and screaming at me? Just let me finish my answer, and then you can say whatever you want to say."

The former New York City mayor pressed that Romney intends to cut taxes for everyone, not just high-income individuals.

"I believe in the Ronald Reagan approach that you should not feed the beast. Let's put the beast on a diet. Let's see if they can spend a little less money, that may force them to do actually some cutting," Giuliani said.

"Does the Department of Homeland Security and related spending through contracts on say private consulting firms like yourself, does that count as feeding the beast or not?" Hayes asked.

"Ok, I have no contract with the Department of Homeland Security. One more try at an ad personam attack, doesn't work. Never done a contract with the Department of Homeland Security...Don't get any money from the government. So you can try all those ad personam attacks all you want," Giuliani said. "Wanna try another one?"

"Well if you're inviting it," Maddow said. She then piled on, asking more questions about Romney's position on the Bush-era tax cuts.

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    US President Barack Obama (R) greets Republican presidential candidate Mitt Romney (L) following the first presidential debate at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney went head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

  • US-VOTE-2012-DEBATE

    US President Barack Obama (R) greets Republican presidential candidate Mitt Romney (L) following the first presidential debate at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney went head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

  • US-VOTE-2012-DEBATE

    US President Barack Obama (R) greets Republican presidential candidate Mitt Romney (L) following the first presidential debate at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney went head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

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    US President Barack Obama (L) and Republican presidential candidate Mitt Romney finish their debate at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

  • Republican presidential nominee Mitt Romney, left, shakes hands with President Barack Obama following the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Eric Gay)

  • President Barack Obama shakes hands with Republican presidential nominee Mitt Romney after the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Pool-Michael Reynolds)

  • President Barack Obama hugs First lady Michelle Obama after the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Pool-Michael Reynolds)

  • Republican presidential nominee Mitt Romney, left, and President Barack Obama speak after the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Eric Gay)

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    Republican presidential nominee Mitt Romney and President Barack Obama laugh after the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Charlie Neibergall)

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  • Mitt Romney

    Republican presidential nominee Mitt Romney gestures during the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Charlie Neibergall)

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    Republican presidential nominee Mitt Romney smiles as President Barack Obama during the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Charlie Neibergall)

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    US President Barack Obama (R) and republican Presidential candidate Mitt Romney (L) participate in the first presidential debate at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012, moderated by Jim Lehrer (C) of the PBS NewsHour. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

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    Republican presidential candidate Mitt Romney (L) speaks during the first presidential debate with US President Barack Obama October 3, 2012 at the University of Denver in Denver, Colorado. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/GettyImages)

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    US President Barack Obama listens during his debate with Republican presidential candidate Mitt Romney at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/GettyImages)

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    US President Barack Obama debates Republican presidential candidate Mitt Romney at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

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    Republican presidential candidate Mitt Romney speaks during his debate with US President Barack Obama at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

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    US President Barack Obama (R) and Republican presidential candidate Mitt Romney (L) participate in the first presidential debate at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012, moderated by Jim Lehrer (C) of the PBS NewsHour. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

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    DENVER, CO - OCTOBER 03: Democratic presidential candidate, U.S. President Barack Obama (R) speaks as Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens during the Presidential Debate at the University of Denver on October 3, 2012 in Denver, Colorado. The first of four debates for the 2012 Election, three Presidential and one Vice Presidential, is moderated by PBS's Jim Lehrer and focuses on domestic issues: the economy, health care, and the role of government. (Photo by Doug Pensinger/Getty Images)

  • Obama And Romney Square Off In First Presidential Debate In Denver

    DENVER, CO - OCTOBER 03: Republican presidential candidate, former Massachusetts Gov. Mitt Romney (L) speaks as Democratic presidential candidate, U.S. President Barack Obama (R) listens during the Presidential Debate at the University of Denver on October 3, 2012 in Denver, Colorado. The first of four debates for the 2012 Election, three Presidential and one Vice Presidential, is moderated by PBS's Jim Lehrer and focuses on domestic issues: the economy, health care, and the role of government. (Photo by Doug Pensinger/Getty Images)

  • US-VOTE-2012-DEBATE

    US President Barack Obama listens during his debate with Republican Presidential candidate Mitt Romney at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/GettyImages)

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    The shadow of Republican Presidential candidate Mitt Romney is projected beneath a copy of The Declaration of Independence during the presidential debate with US President Barack Obama at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

  • US-VOTE-2012-DEBATE

    Republican presidential candidate Mitt Romney participates in the first presidential debate with US President Barack Obama at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012, moderated by Jim Lehrer of the PBS NewsHour. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

  • President Barack Obama answers a question during the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Pool-Michael Reynolds)

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  • US-VOTE-2012-DEBATE

    US President Barack Obama speaks during his debate with Republican Presidential candidate Mitt Romney at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/GettyImages)

  • US-VOTE-2012-DEBATE

    US President Barack Obama speaks during his debate with Republican Presidential candidate Mitt Romney at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. AFP PHOTO / Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/GettyImages)

  • Republican presidential nominee Mitt Romney answers a question during the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Pool-Michael Reynolds)