CNN's Chris Cuomo and President Donald Trump's personal lawyer, former Mayor Rudy Giuliani of New York, got into a 28-minute shouting match during a one-on-one interview Thursday evening.

A Trump phone call is at the center of a recent whistleblower complaint of "urgent concern," according to reports. On Thursday, The Washington Post reported that Ukraine was at issue.

Cuomo had Giuliani on his show to discuss the whistleblower complaint, pointing out that Congress was looking into reports that Giuliani was applying political pressure on Ukraine to help Trump.

Cuomo attempted to interrupt Giuliani to clarify details on whether the lawyer asked Ukraine to look into former Vice President Biden and his son Hunter Biden, a detail Giuliani went back and forth on.

The intensity came to a breaking point as the interview wrapped up.

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CNN's Chris Cuomo and President Donald Trump's personal lawyer, former Mayor Rudy Giuliani of New York, sparred for 28 minutes during a one-on-one interview Thursday evening over Trump's whistleblower scandal.

Reports emerged Wednesday that a recent whistleblower complaint said to be of "urgent concern" was centered on a "promise" Trump had made on a phone call with a foreign leader. On Thursday, The Washington Post cited two former US officials as saying that Ukraine was at the center of the complaint.

Cuomo had Giuliani on his show to comment on the whistleblower complaint and also pointed out that Congress was looking into Giuliani's communications with Ukraine.

The New York Times, which broke the news that Giuliani sought to pressure Ukraine to aid Trump politically, wrote in August that Giuliani was pressuring the Ukrainian government to step up two investigations.

"One is whether Ukrainian officials took steps during the 2016 election to damage Mr. Trump's campaign," The Times said. "The other is whether there was anything improper about the overlap between former Vice President Joseph R. Biden Jr.'s diplomatic efforts in Ukraine and his son's role with a gas company there."

Giuliani had planned to take a trip to Ukraine in May (that never happened) to talk to the incoming Ukrainian president about investigations into Hunter Biden and the 2016 election. The prosecutor who had been looking into the two issues was dismissed over allegations of corruption.

Biden had pressured Ukraine into firing the prosecutor, but PolitiFact did not find evidence that it was related to his son; there was a broader international push for the prosecutor's ouster.

Read more: A major whistleblower complaint at the US's top spy agency involves a Trump phone call with a 'promise' to a foreign leader

Three House committees are looking into whether Trump and Giuliani were trying "to pressure the government of Ukraine to assist the president's reelection campaign" by investigating Trump's political rivals — namely Biden and his family.

The CNN interview started off heated, with Giuliani calling Cuomo's summation of the situation "totally erroneous."

Cuomo attempted to interrupt Giuliani to clarify details on whether the lawyer asked Ukraine to look into Biden, a detail on which Giuliani went back and forth.

"Did you ask the Ukraine to investigate Joe Biden?" Cuomo initially asked when the two were not talking over each other, to which Giuliani replied, "No, I didn't."

A few moments later, Giuliani said he asked Ukraine to get to the bottom of the case that was dismissed by President Petro Poroshenko involving Hunter Biden.

"So you did ask Ukraine to investigate Biden," Cuomo said.

"Of course I did," Giuliani responded.

The intensity came to a breaking point as the interview wrapped up.

"You've been distracting from the truth for a year and a half, and I hope you enjoy it because this president got the benefit of something you built up for decades — your credibility," Cuomo said, "and you put it on the line for him. Good choice."

"I put it on the line for him 1,000%, and I think your network is a horror to this country," Giuliani replied, adding that he could back up his claims with documents.

Cuomo asked Giuliani to give him the documents, to which Giuliani replied, "Why would I give the enemy the documents?"

He went on to call CNN a "creature of the Democratic National Committee" and told Cuomo he should be embarrassed.

"Have a good night," Cuomo said as he ended the interview.

"You shouldn't have a good night because what you're doing is bad for the country," Giuliani said.

Following the interview Giuliani tweeted, "A President telling a Pres-elect of a well known corrupt country he better investigate corruption that affects US is doing his job."

Watch clips of the interview below:

—Cuomo Prime Time (@CuomoPrimeTime) September 20, 2019

—Cuomo Prime Time (@CuomoPrimeTime) September 20, 2019