Ohr is linked to a dossier on Trump's campaign and Russian Federation, compiled by Christopher Steele, a former British spy.
Trump added that Special Counsel Robert Mueller is also "highly conflicted".
Former federal prosecutor Joe diGenova said that a Hillary Clinton victory in 2016 would have been "extremely detrimental to the rule of law", responding to new revelations about the Trump-Russia dossier.
"The president has a constitutional responsibility to protect classified information and who has access to it, and that's what he's doing is fulfilling that responsibility in this action", Sanders said.
On Friday, 60 former CIA officials issued their own statement, joining a chorus of opposition from the intelligence community to Trump's decisions to threaten to or actually pull clearances. "What they do represent, however, is our firm belief that the country will be weakened if there is a political litmus test applied before seasoned experts are allowed to share their views". Citing unnamed White House sources briefed on the matter, Washington Post alleged that Trump - having revoked Brennan's security clearance - is eager to move against other Russian Federation probe-tied officials, and that he has made a list of individuals he'd like to strip of clearances.
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Two of those who signed the statement - former director of national intelligence James Clapper and former CIA director Michael Hayden - are, according to Mr Trump, on a list of people who could lose their clearance.
In August 2016, just two days after Brennan briefed Senator Harry Reid and other members on Russian interference in the election, the Nevada senator wrote a letter to then-FBI director James Comey, calling the FBI to investigate Trump's campaign.
"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", the statement read.
Others who have earned their security clearance are also speaking out against the move.
"It's nearly as if the president is connecting the dots for Robert Mueller", Tapper said, according to The Hill, adding that "despite the best efforts of the White House staff to act as if this decision was about protecting classified information, President Trump made it clear it was actually about punishing one of his fiercest critics". All are critics of the president or are people who Trump appears to believe are against him.
Trump announced on Wednesday that he was revoking Brennan's security clearance, first citing that the former Central Intelligence Agency director posed a security risk. And that's OK with me, because I like taking on voices like that.
"Therefore, I would consider it an honor if you would revoke my security clearance as well, so I can add my name to the list of men and women who have spoken up against your presidency", he added.