This episode is from Newark Mayor Ras Baraka (D).  He claimed last Sunday, with a straight face that

Attorney General Jeff Sessions is “targeting” mayors like himself, and intimidating them into being “fugitive slave catchers that run around and do their bidding in our cities.”

Milwaukee County, WI, Sheriff David Clarke was more polite than I:

I’ve heard a lot of stupid things [but] comparing fugitive slaves to illegal immigrants is the gold standard of stupidity[.]

I say, rather, that Baraka’s TDS has turned him into an irrational election-denier.