Comey, who was sacked by Republican President Donald Trump last May, is doing a series of media interviews that coincide with the release next week of his book, "A Higher Loyalty: Truth, Lies and Leadership".
Meanwhile, Mr. Trump launched into another Twitter tirade against Mr. Comey. Comey is expected to discuss his new book, set for release on Tuesday, and answer questions about the federal investigation into whether Trump's 2016 presidential campaign colluded with Russian Federation.
Trump, who fired Comey, lashed out at the former Federal Bureau of Investigation chief, calling him a "slimeball" and saying it was "unbelievable" that Comey was making decisions "based on the fact that he thought the Democratic presidential candidate "was going to win".
President Donald Trump took to Twitter on Sunday to unload on James Comey over his forthcoming memoir, calling him "slippery", suggesting he should be in jail and labeling him "the WORST FBI Director in history, by far!"
Comey has stood by his decision to reopen the Clinton investigation just 11 days before the November 8, 2016, presidential election.
The FBI reopened the investigation into Clinton's use of a private email server on October 28, 2016, after investigators found classified emails sent to top aide Huma Abedin on husband Anthony Weiner's computer.
"He knows all he said to Congress is I will quote 'look at new information.' He never said I will turn over something to you", continued Davis, who worked in the Bill Clinton White House and remains close to the Clintons.
ABC News' George Stephanopoulos asked if Comey's assumption that Clinton would win the presidency in 2016 was a factor in his decision to send a letter to Congress in October claiming additional emails had been discovered related to the email investigation, days before the election. And so I'm sure that it was a factor.
In the controversial book, Comey offers a scathing, critical depiction of the President, writing that Trump is "unethical and untethered to the truth". Stephanopoulos asked Comey in the interview.
In another post, he disputed the memos Comey kept on his encounters with the President - one of which detailed Trump's request for a loyalty pledge.
"I don't remember spelling it out, but it had to have been, that she's going to be elected president and if I hide this from the American people, she'll be illegitimate the moment she's elected, the moment this comes out", Comey said.