MILWAUKEE — When David A. Clarke Jr., the sheriff of Milwaukee County, announced last week that he’d been appointed to a senior position at the Homeland Security Department, Milwaukee residents like me felt two things: relief that we might finally rid ourselves of his disastrous leadership, and deep concern about what his reported new role will mean for the rest of the country.

Sheriff Clarke (whose appointment the Trump administration has not confirmed) has attracted national attention on several occasions over the past year. In July, he drew scrutiny when, writing for The Hill, he suggested there was a “civil war” between law enforcement officers and members of the Black Lives Matter movement. Last week, CNN reported that he had plagiarized portions of his 2013 master’s thesis from several sources, including the American Civil Liberties Union and President George W. Bush’s book, “Decision Points.” (Sheriff Clarke has denied this accusation, and called the CNN journalist who wrote the report a “sleaze bag.”) And with his image accompanying articles that have circulated online, Sheriff Clarke’s penchant for festooning his uniform with an abundance of pins and ribbons has drawn the ire of veterans and inspired comparisons to the over-adorned uniforms beloved by military dictators.

Locals have been aghast at his conduct for years, and our criticism goes far deeper than his outrageous statements, his bizarre fashion choices and even his academic dishonesty. Residents of this county have witnessed a series of embarrassing incidents and, much worse, human tragedy on Sheriff Clarke’s watch.

Many have seen the 2015 tweet in which he went as far as to say that the Black Lives Matter movement would “join forces with ISIS.” Less well known is the fact that a police union, on behalf of two deputies, successfully sued him in 2007 for religious proselytizing. A district court in Milwaukee found his actions unconstitutional, which a federal appeals panel upheld in 2009. Apparently, Sheriff Clarke thought it was appropriate to force his deputy sheriffs to listen to a Christian-themed presentation, without regard for the separation of church and state.