Former CIA Director John BrennanJohn Owen BrennanBrennan: Saudi denials of involvement in Khashoggi's disappearance 'ring hollow' Clinton's security clearance withdrawn at her request Mr. President, tear down the wall hiding those FISA abuses MORE on Friday went after President TrumpDonald John TrumpTrump to fundraise for 3 Republicans running for open seats: report Trump to nominate former Monsanto exec to top Interior position White House aides hadn’t heard of Trump's new tax cut: report MORE over his attacks on former FBI Director James ComeyJames Brien ComeyConservatives fume over format of upcoming Rosenstein interview Former FBI lawyer speaks with House lawmakers on Rosenstein, 2016 Emmet Flood steps in as White House counsel following McGahn departure 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 ObamaDem holds single-digit lead in race to replace Franken Trump rebukes Holder, Clinton with 'jobs not mobs' refrain Nikki Haley powerfully rebuts Trump 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.