Christopher Steele is the world's most famous spy. The ex-MI6 agent's memos alleging Trump-Kremlin links infuriated the president. But how did he compile the dossier and why? Was he a 'bad actor' or patriot? A friend, colleague, mentor and FBI official speak up. Read more about Christopher Steele: www.telegraph.co.uk/crossfire |Sign up to The Telegraph’s US 2020 newsletter for free: www.telegraph.co.uk/podcast-us2020   |Get 30 days’ free access to The Telegraph: www.telegraph.co.uk/audio  |Get in touch: podcasts@telegraph.co.uk  |See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.