The ex-officials say "the president's action regarding John Brennan and the threats of similar action against other former officials has nothing to do with who should and should not hold security clearances - and everything to do with an attempt to stifle free speech". Many people don't even know who he is, and now he has a bigger voice. He said the only question now is whether the collusion that took place "constituted criminally liable conspiracy".
Trump said that in addition to Brennan, the security clearances of nine other former officials are under review.
Signaling that his efforts to target clearances over his frustration with the Russian Federation investigation were not over, Trump tweeted that it was a "disgrace" for Bruce Ohr to be in the Justice Department.
And it underscores why the president's lawyers are fearful of allowing Trump to sit down for an interview with Mueller's team, as Trump has repeatedly said he is interested in doing.
Ohr's wife, Nellie, worked for Fusion GPS during the campaign - something Trump has tweeted about to highlight his assertions of political bias behind the Russian Federation investigation.More news: Ariana Grande pays tribute to Aretha Franklin with 'Natural Woman', and wow
In revoking Brennan's clearance, Trump on Wednesday accused the former Central Intelligence Agency director, one of his most outspoken critics, of making "a series of unfounded and outrageous allegations - wild outbursts on the internet and television - about this Administration".
In his letter McRaven also directly criticized President Trump saying "through your actions, you have embarrassed us in the eyes of our children, humiliated us on the world stage and, worst of all, divided us as a nation".
Describing Trump's move as "inappropriate and deeply regrettable", they insisted "we have never before seen the approval or removal of security clearances used as a political tool, as was done in this case". This comes days after Trump told reporters that he blames Brennan and his other enemies in the intelligence community for Robert Mueller's investigation.
In an opinion piece in The New York Times, Brennan said Trump's decision, announced Wednesday, to deny him access to classified information was a desperate attempt to end Mueller's investigation. "I think that they're very duplicitous".
Earlier this week, press secretary Sarah Sanders was asked during a press briefing why Ohr isn't simply fired, rather than rendered unable to do much of his job if he loses his clearance.