Donald Trump campaigned Wednesday morning in a church in a historically African-American community and sold himself as the candidate who could fix the problems of urban America. Within hours, Trump was proposing a vast expansion of “stop-and-frisk” policing policies that have proved explosively controversial in black communities for encouraging racial profiling. Trump hit the campaign trail with former boxing promoter Don King — who dropped the N-word before a group of pastors at a Cleveland church while extolling Trump as a “gladiator.” King hailed Trump as the rare candidate who would overthrow the existing political system under which minorities have suffered. “The system is the problem, and he’s the only gladiator that will take on the system,” King said.