Washington, Nov 21 (AFP) A former top White House Russia expert testified Thursday that the "fictional narrative" embraced by President Donald Trump that Ukraine meddled in the US elections was fabricated by Russia to wreak havoc in US politics.

Former National Security Council official Fiona Hill, on the fifth day of House Intelligence Committee impeachment hearings, appealed to Republican lawmakers to "not promote politically driven falsehoods that so clear advance Russia's interests."

The unfounded theory that Ukraine -- not Russia -- meddled in the 2016 elections lies at the heart of Trump's alleged bid to improperly pressure Kiev to open investigations into his Democratic opponents.

Trump asked Ukraine President Volodymyr Zelensky in a July 25 phone call to open investigations into former Democratic vice president Joe Biden -- Trump's possible opponent in the 2020 presidential election -- and into the 2016 meddling story.

Democrats pursuing Trump's impeachment allege he froze aid to Ukraine and held up a requested high-profile meeting with Zelensky to extract an announcement from Kiev that it would pursue the investigations.

But Hill suggested that Trump had bought into the Moscow-concocted Ukraine conspiracy theory that was also being pushed by his personal lawyer, Rudy Giuliani.

"This is a fictional narrative that has been perpetrated and propagated by the Russian security services themselves," she told the hearing.

"These fictions are harmful even if they are deployed for purely domestic political purposes," she said.

Hill said she and other US foreign policy officials had pushed hard to disabuse Trump of the notion that Ukraine and not Russia had meddled in the elections three years ago.

The false Ukraine story included the unfounded charge that Democrats hid a secret computer server controlled by the cybersecurity firm Crowdstrike in Ukraine that would prove the Ukraine meddling theory.

Impeachment witnesses have described Trump as obsessed by the theory.

In the July 25 phone call, Trump asked Zelensky for a "favor," saying: "I would like you to find out what happened with this whole situation with Ukraine," he said, mentioning Crowdstrike by name. "The server, they say Ukraine has it."

Republicans say the story justified Trump's demand for an investigation by Kiev.

"President Trump had good reason to be wary of Ukrainian election meddling against his campaign and of widespread corruption in that country," Devin Nunes, the senior Republican on the Intelligence committee, said in Thursday's hearing.

Hill said, however, that there were no grounds to the theory, but that Trump was listening to Giuliani and not the government's Russia and Ukraine experts.

She recounted that John Bolton, the White House national security advisor at the time, said Giuliani "was a hand grenade who going to blow everyone up." By that, Bolton meant Giuliani "was pushing issues and ideas that would come back to haunt us. And that's where we are today," she told the panel. (AFP)

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