Former CIA Director John BrennanJohn Owen BrennanUFOs are an intriguing science problem; Congress must act accordingly How transparency on UFOs can unite a deeply divided nation The world's most passionate UFO skeptic versus the government MORE on Friday went after President TrumpDonald TrumpMajority of Americans in new poll say it would be bad for the country if Trump ran in 2024 ,800 bottle of whiskey given to Pompeo by Japan is missing Liz Cheney says her father is 'deeply troubled' about the state of the Republican Party MORE over his attacks on former FBI Director James ComeyJames Brien ComeyBiden sister has book deal, set to publish in April Mystery surrounds Justice's pledge on journalist records NYT publisher: DOJ phone records seizure a 'dangerous incursion' on press freedom MORE, tweeting that Trump’s “kakistocracy is collapsing after its lamentable journey.”

“As the greatest Nation history has known, we have the opportunity to emerge from this nightmare stronger & more committed to ensuring a better life for all Americans, including those you have so tragically deceived,” Brennan tweeted at Trump.

A kakistocracy is a form of government in which the worst persons are in power.

Brennan has been a regular critic of Trump, warning last month that lawmakers who protect him will face "a reckoning."

If anything, his criticisms have become more pronounced in the last few months. 

Trump lashed out at Comey in a pair of tweets early Friday, calling him a “leaker & liar” and an “untruthful slime ball.” 

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The attack came after multiple media outlets reported on excerpts of Comey’s upcoming book.

Comey writes in the book that Trump had asked him to probe the infamous “pee tape” mentioned in the so-called Steele dossier in order to disprove its existence. The dossier alleges that Trump hired prostitutes to urinate on a bed used by former President Obama and first lady Michelle ObamaMichelle LeVaughn Robinson ObamaBiden wishes Obama a happy birthday Simone Biles takes herself out of fifth Olympic event Michelle Obama to Simone Biles: 'We are proud of you and we are rooting for you' MORE at the Moscow Ritz-Carlton.

Comey also ripped Trump as "untethered to truth" in the book and compared him to a mob boss.

“A Higher Loyalty: Truth, Lies, and Leadership” comes out Tuesday.