Washington (CNN) James Comey's upcoming book burst into public view Thursday evening, offering a remarkable look into the former FBI director's relationship with President Donald Trump.

CNN obtained a copy of the book and corroborated news reports about Comey's highly anticipated recounting of his time in the Trump administration.

Comey's recollections detail what he calls Trump's "mob"-like approach to leadership and take aim at the President's disposition, which he says created "the forest fire that is the Trump presidency."

"This President is unethical, and untethered to truth and institutional values," Comey wrote. "His leadership is transactional, ego driven and about personal loyalty."

After Trump fired Comey as FBI director last May, news emerged that Comey kept contemporaneous memos on his conversations with Trump, claiming Trump had asked him to end the investigation into former national security adviser Michael Flynn. Following reports of the memos, Deputy Attorney General Rod Rosenstein appointed former FBI Director Robert Mueller to lead a special counsel probe into alleged Russian interference in the 2016 election and potential coordination between Trump's associates and Russia.

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