On Wednesday President Trump officially pulled the security clearance still held by former CIA director John Brennan. Brennan responded to the move on Twitter within hours of the announcement.

This action is part of a broader effort by Mr. Trump to suppress freedom of speech & punish critics. It should gravely worry all Americans, including intelligence professionals, about the cost of speaking out. My principles are worth far more than clearances. I will not relent. https://t.co/TNzOxhP9ux — John O. Brennan (@JohnBrennan) August 15, 2018

In July, Brennan called President Trump a traitor.

Donald Trump’s press conference performance in Helsinki rises to & exceeds the threshold of “high crimes & misdemeanors.” It was nothing short of treasonous. Not only were Trump’s comments imbecilic, he is wholly in the pocket of Putin. Republican Patriots: Where are you??? — John O. Brennan (@JohnBrennan) July 16, 2018

In recent days, Brennan has issued regular defenses of former White House staff Omarosa, who secretly recorded Chief of Staff John Kelly in the Situation Room.

It’s astounding how often you fail to live up to minimum standards of decency, civility, & probity. Seems like you will never understand what it means to be president, nor what it takes to be a good, decent, & honest person. So disheartening, so dangerous for our Nation. https://t.co/eI9HaCec1m — John O. Brennan (@JohnBrennan) August 14, 2018

You’re absolutely right. If you were “presidential,” you would focus on healing the rifts within our Nation, being truthful about the challenges we face, & showing the world that America is still that shining beacon of freedom, liberty, prosperity, & goodness that welcomes all. https://t.co/zRHRYAFEAo — John O. Brennan (@JohnBrennan) August 13, 2018

Individuals of conscience who believe in rule of law should denounce this blatant effort to obstruct justice. As Mr. Trump’s desperation to protect himself grows, he could turn words into actions, prompting a Constitutional crisis. Congress must warn Trump of dire consequences. https://t.co/VUU9M2WcYZ — John O. Brennan (@JohnBrennan) August 1, 2018

During the daily briefing at the White House Wednesday afternoon, Press Secretary Sarah Sanders said President Trump is looking to revoke the clearances of a number of former intelligence and law enforcement officials.