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Stephen Sackur speaks to former Arizona sheriff Joe Arpaio. In the United States the sheriff has always had a special status as the defender of their community, the embodiment of law, justice and the American way.

But sheriffs can be politically controversial figures too - none more so than Joe Arpaio, sheriff of Maricopa County Arizona for 24 years until 2016. A self-styled tough guy, who was convicted of criminal contempt and controversially pardoned by president Donald Trump in August. Did Joe Arpaio betray the American values he pledged to uphold?