The Roman Catholic bishop of Orange County is suing a former charity administrator for libel, an escalation in the prelate’s dispute with influential church philanthropists who have complained to the Vatican about his firing of a nonprofit board. Bishop Kevin Vann and the Diocese of Orange’s chief financial officer are seeking a retraction, financial compensation and punitive damages from the ex-administrator for an email in which they contend she gave a “false narrative” that suggested that charity funds might be used to cover clergy sex abuse claims. The Superior Court suit filed earlier this month is the latest development in...