(CNN)President Donald Trump announced Wednesday he has revoked former CIA director John 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. "I have a unique constitutional responsibility to protect the nation's classified information, including by controlling access to it. Today, in fulfilling that responsibility, I have decided to revoke the security clearance of John Brennan, former director of the Central Intelligence Agency," Trump said in a statement dictated in the White House briefing room by his press secretary Sarah Sanders. "Mr. Brennan's lying and recent conduct characterized by increasingly frenzied commentary is wholly inconsistent with access to the nation's most closely held secrets." Brennan is the first former national security official to see his security clearance revoked since the White House announced last month that Trump was considering taking that action against several of his most vocal critics in the national security world. https://www.cnn.com/2018/08/15/politics/john-brennan-security-clearance/index.html Brennan sums up my thoughts on this here: Truly disgusting, authoritarian behavior.