Six documents taken from an old account belonging to Mr Brennan were published by the anti-secrecy group Wikileaks.
The CIA says Wikileaks hacked into Mr Brennan’s email with “malicious intent”, but there was “no indication” that anything classified was released.
However, the documents do include a draft security clearance application containing personal information.
They appear to all date to 2009, when Mr Brennan was seeking security clearance while applying for a job as a White House counter-terrorism adviser.
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