Follow RT for news and stories about US intelligence, including officials like John Brennan. Find the news and stories on his background and career. John Brennan is a former director of the CIA (2013-2017). He holds a number of other positions, for example, he served as chief counterterrorism adviser to the former US president Barack Obama and as assistant to the president for homeland security (2009-2013). Get the news from RT on John Brennan’s relationship with current President Donald Trump, who revoked Brennan's security clearance. John Brennan responded to this action by Donald Trump with criticism, saying that it is part of a broader effort by Trump to suppress freedom of speech.