His comments come just one day after President Trump announced his decision to revoke Brennan's security clearance, marking an unprecedented use of a president's authority over the classification system to strike back at one of his prominent critics.
Former Army Ranger, Benghazi hero and survivor Kris "Tonto" Paranto took to Twitter this week to slam former Central Intelligence Agency director John Brennan after President Trump pulled his security clearance.
Others who have earned their security clearance are also speaking out against the move.
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". "I suspect I'll be taking it away very quickly", Trump told reporters on the South Lawn before leaving the White House for NY.
"I know that I've gotten tremendous response from having done that because security clearances are very important to me - very, very important", Trump said in a brief session with reporters on the White House lawn. He said the only question now is whether the collusion that took place "constituted criminally liable conspiracy".
Trump has repeatedly targeted Ohr as a source for Mueller and his investigation. Ohr had a role in the investigation into Russia's attacks on the 2016 US elections, which Trump has called a 'rigged witch hunt, ' and Trump has threatened revoking security clearances for numerous highly-positioned officials involved in that investigation.More news: Fox News apologizes for using Patti LaBelle photo in Aretha Franklin tribute
The host criticized the reasons the White House gave for revoking Brennan's clearance.
The DOJ official's security access is up for review along with several other Obama-era officials accused of anti-Trump bias in the workplace.
The episode was reminiscent of Trump's shifting explanations for firing Comey and the evolving descriptions of the Trump Tower meeting between top campaign aides and a Kremlin-connected lawyer - both topics of interest to Mueller.
In announcing Comey's firing, the White House initially cited the former Federal Bureau of Investigation director's handling of the probe into Democratic rival Clinton's emails, seizing on the Federal Bureau of Investigation director's decision to divulge details of the probe to the public during her campaign against Trump.
In an interview with NPR's All Things Considered, Hayden said the decision was purely political, and that the White House had revoked Brennan's clearance "as a punitive measure because the president did not like what John was saying about him".