The warrant against Carter Page violated a decades-old norm. And what was the CIA up to in Britain? Thomas J. Baker writes in the Wall Street Journal that Attorney General William Barr got attention when he told Congress he’d examine the origins and predicate for the Federal Bureau of Investigation’s counterintelligence probe of the Trump campaign. He surely set off alarms in certain precincts when he adde “I am not talking about the FBI necessarily, but intelligence agencies more broadly.”