Mr Trump also cited comments from James Clapper, the director of national intelligence, at a Senate hearing earlier this week that he was not aware of any evidence demonstrating collusion between Trump's campaign and Russian Federation.
He added that he felt there was an "incredible" amount of hostility from reporters toward Press Secretary Sean Spicer and Deputy Press Secretary Sarah Huckabee Sanders.
Trump was referencing Clapper's testimony before Senate Judiciary subcommittee Monday that he was not aware of any evidence demonstrating collusion, but Clapper also said he had been unaware of an FBI investigation into the matter until FBI Director James Comey announced it publicly at a House hearing in March.
In the interview, Mr Trump also connected the decision to the FBI's Russian Federation investigation. Mr. Trump's initial letter gave the impression that he was acting on a recommendation from the Justice Department and that Mr. Comey was sacked for mishandling the investigation of Hillary Clinton's emails.
"I was going to fire regardless of [that] recommendation".
According to the White House, one of the many reasons Comey was sacked was because he failed to stop sensitive leaks of information to the media.
Mason: Does he think it's appropriate to threaten someone like Mr. Comey not to speak?
President Donald Trump abruptly fired FBI Director James Comey this week, in a move that has left more questions than answers.
Clapper clarified in an interview Friday, saying he wouldn't have known about collusion, which is the subject of an ongoing FBI counterintelligence investigation.
"You know, I fired a lot of senior people myself and I think the key, when you feel compelled to remove a senior official, is essentially to have all your ducks in a row at the beginning", he said in an interview for CBS News's "Face the Nation" released Friday.
Trump took to Twitter on Friday to blame his "active" presidency for any inaccuracies that his surrogates make at the podium.
"Maybe the best thing to do would be to cancel all future "press briefings" and hand out written responses for the sake of accuracy???"
The warning appeared to suggest that if Comey gave his version of events, the administration might produce tapes of conversations to counter that, although it was not clear if such tapes exist.
After the onslaught of criticism for the way the White House has changed details of its Comey firing narrative, Mr Trump tweeted on Friday that because of his busy schedule and with lots of things happening, it was not "possible for my surrogates to stand at podium with flawless accuracy".