White House press secretary Sarah Sanders announced during Wednesday's daily briefing the Trump administration would be taking away Brennan's clearance.
They include former FBI Director James Comey; James Clapper, the former director of national intelligence; former CIA Director Michael Hayden; former national security adviser Susan Rice; and Andrew McCabe, who served as Trump's deputy FBI director until he was sacked in March.
"This is being looked at on a case-by-case basis", Sanders said, while denying that people's clearances are under review due to their criticisms of Trump.
High-ranking intelligence, military and diplomatic officials are generally permitted to hold onto their security clearances after they leave their jobs so that they can be brought in to offer their expertise later. Asked via email why the statement was initially dated July 26th but not released until mid-August, a White House official said "today is the date of the revocation".
Sanders defended the decision to revoke Brennan's security clearance as one aimed at fulfilling the President's "constitutional responsibility to protect classified information".
Brennan has been a very vocal critic of the Trump administration and has used the weight and gravity of his previous experiences to make what appears - to many laymen at least - to be the well-informed commentary on allegations that the Trump campaign colluded with Russian efforts to undermine the 2016 General Election. She wrote an op-ed for The New York Times in July, saying the USA had "so much to lose and so little to gain" from the Trump-Putin summit - "given this very atypical US President", she added in a tweet.
This week, Brennan sharply rebuked Trump for referring to Omarosa Manigault Newman, the president's former, as "that dog".
The Russia probe is being led by the Federal Bureau of Investigation, the USA domestic intelligence service.
Levin said Trump should continue to "pull" security clearances from former officials who have violated ethics or policy, suggesting Justice Department official Bruce Ohr, former Director of National Intelligence Jim Clapper and now-fired FBI Agent Peter Strzok. "And I think people ought to think seriously about that". At a news conference last month in Finland, Trump stood alongside Russian President Vladimir Putin and openly questioned US intelligence agencies' conclusions that Moscow tried to influence the 2016 election in his favor.
James Comey, the former Federal Bureau of Investigation director.
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YouTube , Facebook , Apple , Spotify, and others have removed some of his and InfoWars' content for violating company policies. A Twitter spokesperson told NPR that Jones' account now has limited functionality.
"I do believe that Mr. Trump made a decision to take this action, as he's done with others, to try to intimidate and suppress any criticism of him or his administration", he said.
Clapper as well as Michael Hayden, the Central Intelligence Agency director under President George W. Bush, accepted analyst positions with CNN and regularly use airtime to criticize Trump.
"It's detrimental to national security, and what does Brennan gain from this?"
"Security clearances for those who still have them may be revoked, and those who have already their lost their security clearance may not be able to have it reinstated", Trump said.
Huckabee Sanders denied that the moves were motivated by politics or the individuals' criticism of the president.
And California Rep. Adam Schiff, the ranking Democrat on the House intelligence committee, tweeted, "An enemies list is ugly, undemocratic and un-American".
He opened by sharing his experiences working with his Russian intel counterpart during the Obama administration and making the claim that the Russians lied, before comparing their actions to that of Trump.
Several Republicans also weighed in, with Sen.
House Speaker Paul Ryan (R-Wis.) said of the threat, "I think he's just trolling people".