President Donald Trump told Russian officials during a meeting last week that firing FBI director James Comey has eased "great pressure" on him, the New York Times (NYT) reported.
NYT cited a document summarizing from the meeting which stated that Trump called Comey a "real nut job."
Comey was leading an FBI investigation into possible collusion between Trump's election campaign and Russia.
NYT calls Trump's comments to Russia "extraordinary"
According to NYT, Trump's "comments represented an extraordinary moment in the investigation, which centers in part on the administration's contacts with Russian officials: A day after firing the man leading that inquiry, Mr. Trump disparaged him - to Russian officials."
White House doesn't dispute NYT report
"I just fired the head of the F.B.I. He was crazy, a real nut job," Trump reportedly told Russian Foreign Minister Sergei Lavrov and the Russian Ambassador Sergei Kislyak during their meeting in the White House.
"I faced great pressure because of Russia. That's taken off," he added.
The White House hasn't disputed the report.
White House official a "person of interest" in Russia probe
The NYT reports come as the Washington Post reported that a serving White House official was named a "significant person of interest" in the probe into Russia's alleged links to the Trump campaign.
Sources familiar with the investigation said the person was someone "close to the president" but didn't provide further information.
Comey to testify before Congress over Russia probe
Comey has agreed to testify in front of the US Senate intelligence committee as part of the panel's investigation into Russia alleged interference in the US election.
Comey's appearance will be intensely scrutinized especially following reports that Trump had urged him to end the FBI investigation into former national security adviser Michael Flynn's connections to Moscow.