In a fit of spite, Donald Trump just revoked the security clearance of former CIA Director John Brennan, who has been a frequent critic of Trump's increasingly-authoritarian style of governance.

Here is the Brennan tweet that finally sent Trump over the edge:

Trump's move is nothing less than a dictator creating a blacklist to silence his critics.

This must not stand. Please join me in thanking John Brennan for his quarter of a century of public service to this country, and more importantly, for Brennan's willingness to stand up to Donald Trump and his increasingly-obscene administration.