(CNN) President Donald Trump's move to revoke former CIA Director John Brennan's security clearance is unprecedented. And as Trump considers revoking the security clearances of more of his critics, security analysts say it could carry dire consequences -- even if they agree he holds the power to do it.

Top officials sometimes maintain their access so that they can provide requested counsel to their successors on classified matters, analysts said. This denial of access will eliminate that as a possibility, national security experts said.

Aside from causing a political backlash, revoking security clearances of former officials who have criticized him also undermines the entire security system -- from a privilege based on status and character -- to a weaponized political tool, security analysts said.

"It is absolutely unprecedented," said former FBI Special Agent Frank Montoya, who has extensive experience in counterintelligence matters. "In the end, the President is the final authority (on security clearances), but it's an abuse of power."

Does Trump have the authority to do this?

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