A former FBI agent says in a new op-ed that he has left the nation's top law enforcement agency due to the "relentless" attacks on the bureau from critics such as President Trump and congressional Republicans. In an op-ed for The New York Times, former supervisory special agent Josh Campbell wrote that "political attacks on the bureau must stop." After more than a decade of service, which included investigating terrorism, working to rescue kidnapping victims overseas and being special assistant to the director, I am reluctantly turning in my badge and leaving an organization I love." Campbell wrote. "Why? So...