Milwaukee County Sheriff David Clarke blasted President Obama’s rhetoric Friday in the wake of the shooting deaths of five law enforcement officers in Dallas. Sheriff Clarke, appearing on “Fox and Friends” to discuss Micah Xavier Johnson, the 25-year-old man accused of ambushing Dallas police officers at a peaceful Black Lives Matter protest, said Mr. Obama uses the bully pulpit after tragedies in ways that sow anger and resentment among the population. “He’s usually popping off at the mouth before he’s been briefed or before he knows any of the facts like he did yesterday,” the sheriff said regarding Mr. Obama’s...