David Cameron said he “would never” have asked other world leaders to dig up dirt on his opponents in the way Donald Trump has been accused of doing.
Mr Trump is accused of asking Mr Zelensky to investigate Democratic opponent Joe Biden’s son for corruption.
Asked for his thoughts on world leaders requesting one another to “dig up dirt” on their political opponents by host John Berman, Mr Cameron said: "It's a conversation I never had and that I would never have.”
Former British Prime Minister David Cameron on the call between President Trump and the Ukrainian president: “It’s a conversation that I never had and never would have...It just doesn't seem right to me.” https://t.co/V0VInJfHCv pic.twitter.com/35rh2y3Hi6— New Day (@NewDay) October 1, 2019
"I don’t think it would be right to do so,” he added.
Mr Cameron went on to say he believed the UK and US had a special relationship regardless of who was in the White House, but added elements of the President’s phone call “don’t seem right”.
“We should fight our political battles at home using conventional weapons, rather than seeking assistance elsewhere,” he said.
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“It just doesn't seem right to me.”
It comes as Democrats have subpoenaed Mr Trump’s lawyer Rudy Giuliani for documents as they ramped up investigations of the president’s dealings with Ukraine.
The House Intelligence, Foreign Affairs and Oversight and Reform panels announced the subpoena as they examine Mr Trump’s efforts to persuade Ukraine to investigate political rival Joe Biden and his family. Mr Giuliani assisted in that effort.
The committees are investigating the matter, the subject of a now-public whistleblower’s complaint, as part of an impeachment inquiry endorsed by House Speaker Nancy Pelosi last week.
They are moving rapidly with a goal of finishing the inquiry, and perhaps even voting on articles of impeachment, by the end of the year.
Mr Trump and Mr Giuliani have acknowledged efforts to influence the Ukrainian president to investigate Hunter Biden’s membership on the board of a Ukrainian gas company at the same time his father was leading the Obama administration’s diplomatic dealings with Kiev.
There has been no evidence of wrongdoing by either Biden.
A secret complaint from the whistleblower, whose name is not publicly known, detailed a July phone call between Mr Trump and Mr Zelenskiy in which the US leader urged the probe.
It also revealed White House efforts to keep the conversation private.