US agents extracted a high-level mole in the Russian government who had confirmed Russian President Vladimir Putin's direct role in interfering in the 2016 presidential election, American media reported.
The individual had been providing information to US intelligence for decades, had access to Mr Putin and had sent pictures of high-level documents on the Russian leader's desk, CNN said.
But the spy was pulled out of Russia, both CNN and the New York Times reported late on Monday.
The Times reported that the CIA initially offered to extract the source in late 2016 over fears about media exposure, after officials revealed the severity of Russia's election interference in extensive detail.
Donald Trump speaks at a conference this week. Source: Getty Images
The informant initially refused - citing family issues and prompting fears the individual had become a double agent, the Times said.
Months later, the agent relented as media inquiries about a mole continued.
CNN, citing an unnamed person it said was involved in discussions on the asset, said the 2017 extraction was over concerns that US President Donald Trump and his cabinet could expose the agent after repeated mishandling of classified intelligence. The CIA vehemently denied this charge.
The network cited the intelligence community's particular concern after Mr Trump confiscated a translator's notes following a 2017 private meeting with Putin.
The CIA's director of public affairs, Brittany Bramell, told CNN: "Misguided speculation that the president's handling of our nation's most sensitive intelligence - which he has access to each and every day - drove an alleged exfiltration operation is inaccurate."
White House press secretary Stephanie Grisham told the network: "CNN's reporting is not only incorrect, it has the potential to put lives in danger."
The individual was key in providing information that led US intelligence to conclude Mr Putin directly orchestrated Russian interference in favour of Mr Trump and against his Democratic rival Hillary Clinton in the 2016 election, the Times said.
The informant also directly linked Mr Putin to the hacking of the Democratic National Committee, resulting in the release of a flood of embarrassing messages, the newspaper reported.
Vladimir Putin votes in local elections in Moscow this month. Source: Getty Images
According to the Times, the agent was the CIA's most valuable Russian asset.
The extraction "effectively blinded" American intelligence to the Kremlin's inner workings during the 2018 US midterm election, the Times report said, as well as the upcoming 2020 presidential election.
On Tuesday, Russian media named the alleged spy, reporting that he had worked at the Russian embassy in Washington before moving to Moscow.
Mr Putin's spokesman Dmitry Peskov said the man who was identified had worked in the Kremlin but had been fired and did not have direct contact with the Russian leader.
Mr Peskov said the US reports were "rather in the genre of pulp fiction."
"I don't know whether he was an agent or not. I can only confirm that he worked for the presidential administration and he was sacked," he said.
US network NBC meanwhile claimed to have found a man living in the Washington area who - according to two FBI sources - matched the descriptions of the man in the CNN report.
When the NBC correspondent approached the home two men - who identified themselves as friends of the Russian - suddenly appeared and questioned why he wanted to speak to the occupant.
