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 Wednesday blasted 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’s decision to revoke his security clearance as an “abuse of power” intended to punish him for his vocal criticism of the president.

“I do believe that Mr. Trump decided to take this action, as he's done with others, to try to intimidate and suppress any criticism of him or his administration,” Brennan said during an interview on MSNBC.

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Brennan said Trump’s decision will not stop him from speaking out.

“If Mr. Trump believes this going to lead me to just go away and be quiet, he is very badly mistaken,” said Brennan, who led the nation’s top spy agency under former President Obama.

But Brennan said he feared the revocation sends "a very chilling message" to the national security community about silencing dissent, whether it is made in public or in private.

Brennan’s comments came just hours after the White House announced Trump has revoked his clearance, arguing his “frenzied commentary” and “erratic conduct and behavior” poses a security threat.

“Mr. Brennan’s lying and recent conduct characterized by increasingly frenzied commentary is wholly inconsistent with access to the nation’s most closely held secrets and facilities, the very aim of our adversaries, which is to sow division and chaos,” Trump said in the statement read by White House press secretary Sarah Huckabee Sanders.

Sanders denied that the move was intended to silence an outspoken critic of the administration.

Brennan said he first learned his clearance had been pulled when a friend called to alert him to Sanders’s comments during Wednesday’s press briefing.

He first responded on Twitter, rebutting Sanders’s claim by describing Trump’s decision as a “politically motivated” effort by the president to crack down on his detractors and insisting he would “not relent” in his criticism of the president.

This action is part of a broader effort by Mr. Trump to suppress freedom of speech & punish critics. It should gravely worry all Americans, including intelligence professionals, about the cost of speaking out. My principles are worth far more than clearances. I will not relent. https://t.co/TNzOxhP9ux — John O. Brennan (@JohnBrennan) August 15, 2018

The former spy chief later suggested on MSNBC that Trump is lashing out at him because he is feeling pressure from special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s investigation into Russia’s interference in the 2016 election. Trump’s former campaign manager, Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, is facing criminal charges stemming from the probe, and his trial is reaching its conclusion.

Trump has increasingly raged against Mueller’s probe, casting it as a “witch hunt” and urging Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE to shut it down.

"Clearly I think Mr. Trump is getting more and more concerned, more and more desperate, more and more frightened,” Brennan said, adding that Trump’s criticism of Mueller is “reprehensible.”

"I think he fears individuals who could damage him, who could damage his standing among the American people,” he added. “Look at the way he is talking about Bob Mueller, who is a national treasure, an icon within the law enforcement and justice communities, who is doing his level best to investigate Russian interference in the election.”

The White House also said that Trump is considering revoking security clearances of other former officials, including former FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE, former CIA Director Michael Hayden and Peter Strzok, the ex-FBI agent who was fired by the bureau on Monday after an inspector general investigation revealed text messages critical of the president during the 2016 contest.

The president is also reviewing the clearance of Bruce Ohr, a Justice Department official who has become the target of House Republicans in their investigation into the controversial Steele dossier. Brennan indicated Wednesday he was particularly disturbed by that detail, given that Ohr, unlike the others, still works in the government.

“Is this an effort to try to cow individuals both inside and outside the government to make sure they don’t say anything that either is critical of Mr. Trump or with which he disagrees?” Brennan asked.

Avery Anapol contributed. Updated at 5:38 p.m.