Former CIA Director John BrennanJohn Owen BrennanOvernight Defense: Capitol Police may ask National Guard to stay | Biden's Pentagon policy nominee faces criticism | Naval Academy midshipmen moved to hotels Republicans blast Pentagon policy nominee over tweets, Iran nuclear deal Online and frighteningly real: 'A Taste of Armageddon' MORE on Friday went after President TrumpDonald TrumpTrump: McConnell 'helpless' to stop Biden from packing court Romney on NRSC awarding Trump: Not 'my preference' McConnell sidesteps Trump calling him 'dumb son of a b----' MORE over his attacks on former FBI Director James ComeyJames Brien ComeyShowtime developing limited series about Jan. 6 Capitol riot Wray says FBI not systemically racist John Durham's endgame: Don't expect criminal charges 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 ObamaObamas describe meeting Prince Philip in statement mourning his death Overnight Defense: Trump-era land mine policy unchanged amid review | Biden spending outline coming Friday | First lady sets priorities for relaunched military families initiative Jill Biden unveils next phase of military families program 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.