Roger Stone's experience with U.S. Presidents dates back to Richard Nixon in 1972. Now, with the former Trump adviser facing charges under the Mueller probe into the 2016 election, ex-Clinton Administration official Steven Okun charts Stone's colourful career as a political operative.

<p>Roger Stone's experience with U.S. Presidents dates back to Richard Nixon in 1972. Now, with the former Trump adviser facing charges under the Mueller probe into the 2016 election, ex-Clinton Administration official Steven Okun charts Stone's colourful career as a political operative.</p>

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