Former CIA Director John BrennanJohn Owen BrennanWhere was American counterintelligence? Krystal Ball: Yang's MSNBC boycott shows network has 'officially lost the left' Trump predicts 'historic' conclusions from DOJ's watchdog report on 'spying' MORE on Friday went after President TrumpDonald John TrumpRepublicans aim to avoid war with White House over impeachment strategy New York Times editorial board calls for Trump's impeachment Trump rips Michigan Rep. Dingell after Fox News appearance: 'Really pathetic!' MORE over his attacks on former FBI Director James ComeyJames Brien ComeySunday Talk Shows: Lawmakers look ahead to House vote on articles of impeachment, Senate trial The Hill's 12:30 Report — Presented by UANI — Judiciary Democrats approve articles of impeachment setting up House vote next week Huckabee teases Hannity appearance, says he'll explain why Trump is eligible for third term 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 ObamaMichelle Obama encourages Greta Thunberg after Trump attack: 'Ignore the doubters' Panel: Andrew Yang beats Joe Biden in ad dollars, Michelle Obama on GWB 'our values are the same' Michelle Obama, Ellen DeGeneres surprise DC elementary school with new computer lab, 0K donation 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.