Chris Christie is looming large behind the scenes of Donald Trump’s presidential campaign, coaching him before the last GOP debate and lining up policy experts, donors and big-name backers, according to a report Friday. The New Jersey governor is far more than just a high-profile supporter and has become one of Trump’s most trusted advisers, NJ.com reported. “Christie is clearly making the transition from endorser to enabler and positioning himself to be a major player in the Trump camp,” David Kennedy, a presidential historian, told NJ.com. Edward Newton, who vetted Christie when he was considered a possible running mate for...