President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE again attacked former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE on Saturday, days after he pulled Brennan’s security clearance, calling him “a loudmouth, partisan, political hack.”

“Has anyone looked at the mistakes that John Brennan made while serving as CIA Director?” Trump tweeted Saturday.

“He will go down as easily the WORST in history & since getting out, he has become nothing less than a loudmouth, partisan, political hack who cannot be trusted with the secrets to our country!” the president continued.

Has anyone looked at the mistakes that John Brennan made while serving as CIA Director? He will go down as easily the WORST in history & since getting out, he has become nothing less than a loudmouth, partisan, political hack who cannot be trusted with the secrets to our country! — Donald J. Trump (@realDonaldTrump) August 18, 2018

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Brennan, a prominent critic of the president, again spoke out against Trump during an appearance on MSNBC on Friday.

“[Trump’s] drunk on power, he really is,” Brennan told host Rachel Maddow. “And I think he’s abusing the powers of that office.”

The White House announced earlier this week that Trump was pulling Brennan's security clearance, citing the former CIA official's "lying and recent conduct characterized by increasingly frenzied commentary."

It is not clear what "mistakes" in Brennan's record Trump referenced.

Brennan and other intelligence officials have decried the change in his clearance as an attempt to silence him.

The Washington Post reported Friday that the White House has drafted several more notices on revoking the security clearances of other officials, and that communications staffers are planning on deploying them during negative news cycles.