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Donald Trump's pardon of Joe Arpaio, as Mr. Friedersdorf himself has pointed out, along with many other able commentators, has a real potential to unravel the rule of law. The presidential power of pardon has few specific limits, but the United States Constitution certainly never intended it to permit the President to undermine a prosecution, much less a law, the president simply disapproved of. The specific pardon of Mr. Arpaio, whom President Trump pardoned for offences related to civil rights violations, makes the situation more troubling. Issuing a pardon for someone who has never expressed regret or admitted wrongdoing means one of two things: either the President believes the court made a serious error of fact, or he condones the offence. If officials with the power to pardon violators actively condone civil rights violations, they effectively strip some, and in the end all, members of the community of their civil rights.
This illustrates what I call the Skywalker rule of constitutions: like the death star, every written constitution has to have a relief port.