July 7, 2017: After a banquet later the same day, Trump and Putin chat again for about an hour.
USA officials learned of this conduct after a 2017 meeting between Trump and Putin in Hamburg, Germany, when a White House adviser and a senior State Department official wanted more information than was provided by former Secretary of State Rex Tillerson, who also attended the meeting, the Post reports.
"Obviously nothing was found", Trump said.
Trump dismissed the notion in Saturday's interview, but without ever directly denying that he was working as a secret agent for Russian Federation.
Administration officials have been unable to glean details of at least three other public interactions between the leaders over the past two years.
He said he had talked in Helsinki to the Russian leader "like every president does" and that they had had a "great" conversation about "very positive things" such as the economy.
"Outrageous", former Deputy Secretary of State Strobe Talbott called the obsession with secrecy.
"It handicaps the USA government - the experts and advisers and Cabinet officers who are there to serve - and it certainly gives Putin much more scope to manipulate Trump".
No evidence has publicly emerged that Trump was secretly in contact with or took direction from Russian officials, the Times said.
Trump called in to Fox News' Justice with Jeanine to discuss several tropics, including the newspaper's article, which was published on Friday, that revealed the president had been the subject of an FBI counterintelligence investigation in 2017 after James Comey was sacked as director of the federal agency.
Trump blasted the FBI on Twitter, insisting it acted "for no reason & with no proof" when it opened the investigation.
The New York Times said FBI officials became suspicious of Mr Trump's ties to Russian Federation during the 2016 presidential campaign but held off on opening an investigation until Mr Trump tied his dismissal of Mr Comey to a probe into allegations of election meddling by Russian Federation.
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That investigation was taken over by Special Counsel Robert Mueller when he was appointed in May of 2017.
"Anybody could listen to that meeting, that meeting is open for grabs", Trump added.
"Wow, just learned in the Failing New York Times that the corrupt former leaders of the FBI, nearly all fired or forced to leave the agency for some very bad reasons, opened up an investigation on me, for no reason & with no proof, after I fired Lyin' James Comey, a total sleaze!"
"The FBI was in complete turmoil (see N.Y. Post) because of Comey's poor leadership", he tweeted.
"I call him "Lying James Comey" - he did a bad job as Federal Bureau of Investigation director", Trump told Pirro.
Asked in a late Saturday interview with Fox News whether he had ever worked for Russia, Trump replied: "I think it's the most insulting thing I've ever been asked... They've actually gotten me wrong for many years before that", Trump said. "You sit with the president of various countries", Trump said.
Meanwhile, White House press secretary Sarah Huckabee Sanders said in a statement that the Post's story is "outrageously inaccurate".
"And I can tell you this, if you ask the folks in Russian Federation, I've been tougher on Russian Federation than anybody else, any other - probably any other president period, but certainly the last three or four presidents, modern day presidents".
Trump has repeatedly denied any collusion.
The Times says it's unclear whether Mueller is still pursuing the counterintelligence angle.
Trump's ex-national security advisor, Michael Flynn, has pleaded guilty to lying to investigators about his Moscow ties.
Mueller has indicted 33 people in the probe and convicted some of the president's close associates.
Such a gap would be unusual in any presidency, let alone one that Russian Federation sought to install through what United States intelligence agencies have described as an unprecedented campaign of election interference.