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Cyber-attack expert says he's 'not a hero'

Trump/Comey: What's it all about?

Did Trump threaten FBI ex-boss in tweet? Video, 00:01:00Did Trump threaten FBI ex-boss in tweet?

White House story on Comey collapses. Video, 00:01:44White House story on Comey collapses

Trump warns sacked FBI boss over leaks

Trump says he is not under investigation

Idea Trump would condone collusion 'insane' Audio, 00:00:45Idea Trump would condone collusion 'insane'

How the White House Comey story collapsed

FBI sacking: Five things you wanted to know

Is Trump's thin skin to blame?

Not quite the Saturday Night Massacre

Trump 'considered firing Comey since vote'

Trump defends firing of FBI chief Comey

Trump says Comey was not doing 'good job' Video, 00:00:36Trump says Comey was not doing 'good job'

You're fired! Top tips for sacking staff

Reality Check: What powers does President Trump have?

Trump fires FBI chief Comey

Comey fired: US media shock and praise

Ex-CIA director: Firing Comey 'sends chills' Audio, 00:01:35Ex-CIA director: Firing Comey 'sends chills'

FBI director escorted by motorcade. Video, 00:00:36FBI director escorted by motorcade

President Trump sacks FBI chief Comey. Newsday. Audio, 00:01:01President Trump sacks FBI chief Comey

Trump's love-hate relationship with Comey. Video, 00:02:56Trump's love-hate relationship with Comey

Did Trump fire Comey as part of a cover-up?