Advance sales push Comey’s book to No. 2 on best-sellers list
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Former FBI Director James ComeyJames Brien ComeyMcCabe says ‘it’s possible’ Trump is a Russian asset McCabe: Trump ‘undermining the role of law enforcement’ Trump has publicly criticized Russia probe more than 1,100 times: NY Times MORE's unreleased book has risen to the No. 2 spot on Amazon's list of best-sellers.

"A Higher Loyalty: Truth, Lies, and Leadership," which is scheduled to be released on April 17, has seen a surge in preorders.

The book had been No. 15 on the list on Saturday morning, CNN reported, but jumped in the rankings by Sunday morning.

Within hours of the initial publication of this story, the book shot to the number one spot on Amazon's best-seller list.

Comey is expected to use his upcoming book tour to directly rebut President TrumpDonald John TrumpTrump nominates Jeffrey Rosen to replace Rosenstein at DOJ McCabe says ‘it’s possible’ Trump is a Russian asset McCabe: Trump ‘undermining the role of law enforcement’ MORE's attacks on the FBI.

Trump has taken to Twitter in recent days to attack Comey following the firing of FBI Deputy Director Andrew McCabeAndrew George McCabeTrump nominates Jeffrey Rosen to replace Rosenstein at DOJ McCabe says ‘it’s possible’ Trump is a Russian asset McCabe: Trump ‘undermining the role of law enforcement’ MORE

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On Saturday, Trump tweeted that the "Fake News" was "beside themselves that McCabe was caught, called out and fired."

"How many hundreds of thousands of dollars was given to wife’s campaign by Crooked H friend, Terry M, who was also under investigation?" he tweeted, referring to Hillary ClintonHillary Diane Rodham ClintonSanders campaign reports raising M in less than a day The Memo: Bernie Sanders’s WH launch sharpens ‘socialist’ question Roger Stone invokes gag order in new fundraiser MORE and former Virginia Gov. Terry McAuliffe (D).

"How many lies? How many leaks? Comey knew it all, and much more!"

On Sunday, Trump again took to Twitter to go after Comey, accusing him of lying under oath.

“Wow, watch Comey lie under oath to [Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyOn The Money: Smaller tax refunds put GOP on defensive | Dems question IRS on new tax forms | Warren rolls out universal child care proposal | Illinois governor signs bill for minimum wage Smaller tax refunds put GOP on defensive High stakes as Trump, Dems open drug price talks MORE (R-Iowa)] when asked ‘have you ever been an anonymous source...or known someone else to be an anonymous source...?’ ” Trump tweeted.

"He said strongly 'never, no.' He lied."

Trump also referred to the former FBI director as "lying James Comey" in a subsequent tweet.

Comey, who was fired by Trump last year, on Saturday posted a tweet directed at the president, saying the American people will "hear my story very soon."

"And they can judge for themselves who is honorable and who is not,” Comey tweeted.

Updated at 4:27 p.m.