Moscow has played down reports in American media that the US extracted a high-level spy from Russia in 2017 fearing his cover could be blown.
The Kremlin said a man named by Russian media as Oleg Smolenkov was employed only at a low level and had been fired.
A Kremlin spokesman said he did not know if Mr Smolenkov was a spy and that the extraction reports were “fiction”.
A CNN report said the CIA had feared President Trump’s “mishandling” of intelligence could put the spy at risk.
CNN said the extraction came after the president met senior Russian officials, including Foreign Minister Sergei Lavrov, in the White House in May 2017 and had unexpectedly shared classified US intelligence.
The CIA said CNN’s reporting of the extraction was “misguided” and “simply false”.
What was alleged in the US media reports?
CNN released the initial report on Monday, citing “multiple Trump administration officials with direct knowledge” of the extraction operation.
The alleged agent was not named by US media but it was claimed the intelligence asset was the highest-level US source inside Russia, with regular access to President Vladimir Putin.
The reports said the source had spied for the US for more than a decade.
The New York Times said the agent was instrumental in the conclusion by US intelligence agencies in 2016 that Mr Putin had personally orchestrated Russia’s interference in the US presidential election.
However, its report said the CIA had wanted to extract the agent before Mr Trump took office because investigations by media were putting the asset at risk. There was no suggestion President Trump had directly compromised the source, it said.
How has Russia responded?
Russian media quickly came up with the name of Oleg Smolenkov.
The Kommersant newspaper said he had gone on holiday with his family to Montenegro in 2017 and disappeared, before a man with the same name and a woman with the same name as Mr Smolenkov’s wife purchased a house in the US state of Virginia, near Washington DC.
Without naming the alleged agent at the request of US officials, NBC News said one of its reporters had visited the home on Monday and found the man was “living openly under his true name”. The reporter was tracked by two men in an SUV when he rang the doorbell, NBC said.
Russian reports said Mr Smolenkov had worked for Yury Ushakov, a senior aide to President Putin.
Kremlin spokesman, Dmitry Peskov, said: “It is true that Smolenkov worked in the presidential administration but he was fired several years ago. His job was not at a senior official level.”
He could not confirm whether Mr Smolenkov was a spy, but added: “All this US media speculation about who urgently extracted who and saved who from who and so on – this is more the genre of pulp fiction, crime reading, so let’s leave it up to them.”
Mr Lavrov said he had never seen or met Mr Smolenkov and that no state secrets had been divulged at the White House meeting with Mr Trump.
It sounds like the makings of a John le Carré espionage novel. A high-level intelligence asset – one who provided key information about an attempt to sabotage a US presidential election – is extracted from Russia in the face of potentially grave danger.
If multiple media reports are to be believed, however, this is real life – and the US political consequences could be significant.
The episode highlights the US intelligence community’s concerns about Donald Trump and his associates in the early days of his presidency. It reflects a conclusion that an undisciplined commander-in-chief could pose a national security risk – even if only inadvertently.
Those concerns were already public knowledge, of course, but this is the most dramatic example of their consequences.
The Trump administration has vehemently denied the reporting. The president, who has spent much of his time feuding with, and occasionally directly condemning, the US intelligence community – the so-called “deep state” – surely will be furious.
This revelation will only make White House tensions with, and suspicions about, the personnel who provide the president with clandestine information about world affairs all the more acute.