Last week, Mayor Eric Adams said he’d deciphered the rationale behind the federal corruption charges brought against him last September.

His source? The book “Government Gangsters: The Deep State, the Truth, and the Battle for Our Democracy,” by FBI director Kash Patel.

“I’m going to encourage every New Yorker to read it,” he said during a brief address outside Gracie Mansion on Thursday after a federal judge officially dismissed his case.

The book is a screed against the so-called Deep State, “a cabal of unelected tyrants,” Patel writes, that has carried out politicized investigations and sought to undermine President Donald Trump.

He blasts the use of selective leaks, a frequent complaint of Mayor Adams in relation to his case. “When I read the book, I couldn’t help but to say, ‘Hey, sounds like me,’” Adams said at a separate, unrelated news conference last Thursday.

The mayor claims federal prosecutors brought charges against him as retribution for speaking out against President Joe Biden’s immigration policy. But in dismissing Adams’ case, Judge Dale Ho wrote: “There is no evidence — zero — that they had any improper motives.”

Patel’s book focuses in part on the so-called Russia Gate investigation into potential ties between the Trump campaign and Russia. The investigation ultimately turned up no evidence of collusion, and the FBI relied on the largely discredited Steele Dossier to obtain a warrant to monitor the Trump campaign.

It’s “the greatest political scandal in American history,” writes Patel, who makes other hyperbolic and sometimes unfounded claims in running through a laundry list of right-wing grievances.

Biden, he writes, was “bought and paid for by the Chinese.” The suppression of the Hunter Biden laptop story was “the biggest cover-up in American history” and effectively meant the 2020 election “was rigged.” And the classified documents raid on Trump’s Mar-a-Lago estate was a “mafia-style mob invasion.”

Patel also downplays the Jan. 6 assault on the U.S. Capitol. He slams prosecutors for going after “people who happened to be in the wrong place at the wrong time,” rather than “genuine law breakers.” He also alludes to “all sorts of strange agitators who were at the Capitol on Jan. 6 and stirred up the crowd.”

Patel, who was raised on Long Island, wrote the book in 2023 after having served in high-ranking national security and intelligence positions in the first Trump administration.

He also told a fictionalized version of events in a series of children’s books titled “The Plot Against the King.”

Now, he’s Trump’s FBI director, running an agency he wrote in “Government Gangsters” was “utterly corrupt.”

Adams, meanwhile, deflected when asked by NY1 at a news conference last week about his views on Jan. 6, instead saying the book pointed out concerning and alarming issues.

“If you read it and you are a God-fearing American and you’re not concerned about some of those factual aspects of the book,” he said, “then I think we have blinders on.”