The presidential pardon of Sheriff Joe Arpaio was a message to Donald Trump's supporters: if you defy a federal court order, I've got your back. David explains how the notorious Maricopa County, Ariz., sheriff was convicted of contempt of court, and why his pardon sets a dangerous precedent.
Read MoreLess than a month after addressing the Republican National Convention, the man who calls himself America's toughest sheriff -- Joe Arpaio of Maricopa County, Arizona -- could be facing criminal contempt charges in federal court.
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