Donald Trump has revoked the security clearance of ex-CIA chief John Brennan, denying the US president's critic any access to sensitive information.
White House press secretary Sarah Sanders announced the decision by reading a statement from Mr Trump.
The statement cited Mr Brennan's "erratic conduct and behaviour".
In response, Mr Brennan tweeted that the move was part of President Trump's broader effort to "suppress freedom of speech and punish critics".
"It should gravely worry all Americans, including intelligence professionals, about the cost of speaking out.