Having slammed President Barack Obama’s clemency for Pfc. Chelsea Manning, we can’t let President Trump’s pardon of Arizona ex-Sheriff Joe Arpaio pass.

Manning swore to defend the nation, but was found guilty of espionage against it. Arpaio swore to uphold the law, but was found guilty of criminal contempt for defying a judicial order.

Manning felt justified because she was exposing supposed abuses in the War on Terror. Arpaio felt justified because he was supposedly seeking to enforce US immigration law. Each was wrong, and defied a sacred oath in the course of committing a crime.

Neither Arpaio’s age nor Manning’s personal issues were sufficient grounds for mercy. And it’s far worse to suggest, as each pardon in its own way did, that good intentions somehow made the crime any less.

We hope this is the last Obama mistake Trump repeats.