President Donald Trump responded angrily to reports that he is under criminal investigation on Thursday, deriding a "witch hunt" against him led by some "very bad" people.
Comey acknowledged that he had told Trump at the time that Trump was not a target of the FBI investigation.
Trump also denied again in the morning tweets any kind of collusion with the Russian government.
Trump's young presidency has been battered by allegations - under investigation both by Congress and the FBI - that Russian Federation interfered to sway the November election in his favour.
The move was confirmed by a transition official who spoke on condition of anonymity to discuss post-election decisions.
The FBI probe, now in the hands of special counsel Robert Mueller, reportedly shifted its focus to allegations of obstruction in the days after Trump fired the agency's then-director James Comey on May 9. He took to Twitter, Thursday to rail on the prospects of being investigated for allegedly asking fired FBI Director James Comey to stop investigations into former national security adviser Michael Flynn.
In riveting testimony last week, Comey detailed how prior to the firing, Trump invited and corralled him into a series of private meetings.
The special counsel overseeing the probe into Russia's alleged meddling in the USA election is now looking at whether President Donald Trump attempted to obstruct justice, the Washington Post reported Wednesday, citing unnamed officials. Trump conceded in an interview after the episode that he was thinking about the Russian Federation controversy when he made that decision.
Trump also attacked the media Friday morning. Pence headed the Trump transition until Inauguration Day.
The transition official said the organization has also separately asked the General Services Administration to preserve records from the Trump transition that were transferred to its facilities after Trump's inauguration. The transition, a nonprofit structurally separate from the Trump campaign, continues to operate with a small staff.
The White House confirmed Mr Mueller was among the candidates the president interviewed to replace Mr Comey. The memo asks for preservation of electronic communications and data, telephone logs, audio recordings, videos, calendars and other items.
He said his copies are now in the possession of the special prosecutor, Robert Mueller, and his friend said he returned his copy to the Federal Bureau of Investigation.
This is what he said in May.
A person familiar with Trump's tweet said the President was referencing news reports that he is under investigation and was not indicating that he's been personally informed by the special counsel that he is a target of the probe.
"Why is that Hillary Clintons family and Dems dealings with Russian Federation are not looked at, but my non-dealings are?" he asked.
While a sitting president is unlikely to face criminal prosecution, obstruction of justice could form the basis for impeachment.