"[He] badly overstepped his bounds", a Clinton quote says.
President Trump greets then-FBI Director James Comey at the White House on January 22, 2017.
"Comey is a liar and a leaker and his misconduct led both Republicans and Democrats to call for his firing", McDaniel said.
Kelly added that he "intended to quit", Comey writes, and "said he didn't want to work for dishonorable people".
The official told Fox News that the RNC has prepared a rapid response team to respond to claims made in Comey's book, compiled a research team to fact check, and created a "war room" to monitor his appearances.
Speaking during his opening monologue on "Hannity" Wednesday, Sean slammed former FBI chief James Comey over his impending book tour; adding the disgraced bureau boss was ready to "cash in" on his hatred for the President. Bob Corker laughed on Thursday when Business Insider asked him about lyincomey.com, and said he respected Comey's public service.
Kamal Haasan writes open letter to Modi on Cauvery management issue
Please do justice for Tamil Nadu and Karnataka and see to that the Supreme Court judgement is followed. This is an open appeal to the Prime Minister.
According to sources, Comey writes in his book that he encouraged Kelly to remain in his post, saying "this president", more than his predecessors, needed people of principle and integrity around him.
Republican Sen. Lindsey Graham of SC told Fox News that he believed Comey was acting politically when he had a friend leak memos he'd written to The New York Times "for the express goal of having a special counsel" investigate Trump.
Last month, Trump also lashed out at Comey, accusing him of lying under oath.
Comey's book A Higher Loyalty: Truth, Lies, and Leadership comes out on April 17.
Doug Heye, a former RNC communications director, said the Republican effort shows Comey's publicity tour is "going to dominate news coverage".
Although the preview only features Stephanopoulos' line of questioning, of which Comey apparently answered each and every one, the implications alone are damning.
The interview airs on ABC News Sunday night at 10:00 p.m. EST.