A fierce debate has broken out among Donald Trump’s family, friends and campaign advisers over how to respond to the Republican establishment’s last-ditch effort to deny him the presidential nomination. Trump’s confidants are split over how to handle the sudden onslaught, with some saying he should become more presidential. But according to a high-ranking member of Trump’s inner circle, Trump is ignoring this advice and listening to his own inner Donald. The debate broke out after Mitt Romney viciously attacked Trump as a “phony” and “fraud” during a speech Romney delivered at the University of Utah in Salt Lake City...