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WASHINGTON, DC - JUNE 08: Former FBI Director James Comey leaves a closed session with the Senate Intelligence Committee in the Hart Senate Office Building on Capitol Hill June 8, 2017 in Washington, DC. Comey said that President Donald Trump pressured him to drop the FBI's investigation into former National Security Advisor Michael Flynn and demanded Comey's loyalty during the one-on-one meetings he had with president. (Photo by Drew Angerer/Getty Images)
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WASHINGTON, DC - JANUARY 22: U.S. President Donald Trump (L) shakes hands with James Comey, director of the Federal Bureau of Investigation (FBI), during an Inaugural Law Enforcement Officers and First Responders Reception in the Blue Room of the White House on January 22, 2017 in Washington, DC. Trump today mocked protesters who gathered for large demonstrations across the U.S. and the world on Saturday to signal discontent with his leadership, but later offered a more conciliatory tone, saying he recognized such marches as a "hallmark of our democracy." (Photo by Andrew Harrer-Pool/Getty Images)
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(CNN) —  

President Donald Trump slammed James Comey on Friday as a “weak and untruthful slime ball” and a “proven LEAKER & LIAR,” the day after explosive excerpts from the former FBI director’s tell-all book surfaced in media reports.

“James Comey is a proven LEAKER & LIAR. Virtually everyone in Washington thought he should be fired for the terrible job he did-until he was, in fact, fired. He leaked CLASSIFIED information, for which he should be prosecuted. He lied to Congress under OATH,” Trump tweeted. “He is a weak and untruthful slime ball who was, as time has proven, a terrible Director of the FBI. His handling of the Crooked Hillary Clinton case, and the events surrounding it, will go down as one of the worst “botch jobs” of history. It was my great honor to fire James Comey!”

Comey’s book “A Higher Loyalty,” of copy of which CNN obtained, details his conversations with the President, compares Trump to a mob boss, and slams the “forest fire that is the Trump presidency.”

Comey testified in June that he gave some of his memos of conversations he had with Trump to a Columbia University professor and that he had written the memos specifically to avoid including classified information.

White House press secretary Sarah Sanders also attacked Comey’s credibility Friday.

“One of the few areas of true bipartisan consensus in Washington is Comey has no credibility,” Sanders wrote on Twitter Friday morning.

Her post also included the link to a GOP video titled “Comey Not Credible, Just Ask Democrats.”

White House counselor Kellyanne Conway on Friday also criticized the former FBI director.

“We find Mr. Comey has a revisionist view of history and seems like a disgruntlement ex-employee,” Conway told reporters outside the White House.

Trump’s allies have prepared an extensive campaign to fight back against Comey’s publicity tour, trying to undermine his credibility by reviving the blistering Democratic criticism of him before he was fired nearly a year ago.

The battle plan against Comey, obtained by CNN Thursday, calls for branding him “Lyin’ Comey” through a website, digital advertising and talking points to be sent to Republicans before his memoir is released next week.

The White House signed off on the plan, which is being overseen by the Republican National Committee.

CNN’s Abby Phillip, Noah Gray and Jeff Zeleny contributed to this report.