Washington (CNN) Ukrainian President Volodymyr Zelensky said Tuesday that he has never met with President Donald Trump's personal lawyer Rudy Giuliani, as Zelensky finds himself in the middle of an American political firestorm.

"I never met Rudy Giuliani -- never. And never had any phone calls with him," Zelensky said Tuesday at a news conference in Kiev.

According to a transcript released by the White House of a July 25 call between Trump and Zelensky, the Ukrainian President said that he was aware of Giuliani's efforts to uncover information that would help Trump politically, and Trump encouraged Zelensky to speak with his lawyer because Giuliani "very much knows what's happening." Trump, the transcript showed, pressed Zelensky to work with Giuliani to investigate former Vice President Joe Biden and his son, Hunter.

"I will have Mr. Giuliani give you a call," Trump told Zelensky, according to the White House's transcript of the call.

There is no evidence of wrongdoing by Joe or Hunter Biden.

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