"We didn't speak about this", he told reporters.
A July phone call in which Mr Trump asked Volodymyr Zelenskiy to look into shaky allegations that Mr Biden had gotten a Ukrainian prosecutor general fired because he planned to investigate his son has sparked impeachment proceedings in congress.
Ukrainian President Volodymyr Zelensky said Thursday that despite not knowing whether any Ukrainians interfered in the 2016 US elections, the country will "happily" investigate the matter.
Mr Zelensky told reporters that his aim in having a phone call with Mr Trump was to arrange a subsequent meeting and that he had asked the White House to change its rhetoric on Ukraine.
Zelensky said he "didn't even check" to determine whether his government's record of the call matched that of the White House's, but added "I think they match".
The July call is central to the impeachment inquiry, and embarrassed Zelenskiy because it showed him as eager to please Trump and critical of European partners whose support he needs to strengthen Ukraine's economy and to end the conflict with Russian Federation. This real-time concern by officials in the White House directly contradicts Trump's repeated claim that the call was considered "perfect", and precede by more than two weeks the whistleblower's official complaint.
The accounts are sharply at odds with Trump's depiction of the call as a "perfect" exchange in which he "did nothing wrong", despite appearing to link USA support for Ukraine to that country's willingness to investigate the family of the former vice president.
"I don't want to interfere in any way in the elections" in the U.S., he said.
He and Trump later spoke to the press before a meeting and Zelensky said that the call "was normal" and that "nobody pushed me".
Officials said that within hours of the 9 a.m. conversation, a rough transcript compiled by aides had been moved from a widely shared White House computer network to one normally reserved for highly classified intelligence operations.
Biden forced out former Ukrainian prosecutor Viktor Shokin as he was investigating an energy company called Burisma Holdings, which was paying Biden [$83,000 monthly] as a member of its board. "And in case we need to find a solution to questions of this level, questions about our country's security, we use all our powerful possibilities".
Trump has said the United States has an "absolute right" to ask foreign leaders to investigate corruption cases, though no one has produced evidence of criminal wrongdoing by the former U.S. vice president or his son.
Zelensky has repeatedly emphasized that he felt no pressure during the call but in new remarks seemed to go further, specifically saying on October 10, "There was no blackmail".
Ukraine's president just can't stop talking.
Most of the questions at Thursday's unusual media event related to the Russian Federation conflict or Ukraine's economic troubles. -Ukrainian relations in the future, "but if there is, we'll learn about it on Twitter".