Washington (CNN) Former New Jersey GOP Gov. Chris Christie knocked a series of departed, high-profile members of the Trump administration in his upcoming book, according to excerpts published on Monday by Axios.

"Far too often, he's found himself saddled with the riffraff," Christie said in the book.

According to the excerpts, Christie believes Trump needed to surround himself with "high quality" people.

"Donald so urgently needed the right people around him and a solid structure in place," he wrote.

Christie dubbed former national security adviser Michael Flynn a "Russian lackey and future federal felon," former Environmental Protection Agency chief Scott Pruitt "greedy and inexperienced," former Health and Human Services Secretary Tom Price -- who was ousted in 2017 for using private jets for multiple government business trips -- "high flying," former Attorney General Jeff Sessions "not-ready-for-prime-time" and former Secretary of State Rex Tillerson "a stranger."

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