Fritsch, who served as the Journal’s bureau chief in Mexico City and has lectured at the liberal Wilson Center’s Mexico Institute, married into a family with Mexican business interests. His wife, Beatriz Garcia, formerly worked as an executive at Grupo Dina, a manufacturer of trucks and buses in Mexico City that benefits from NAFTA, which Trump opposes. Fritsch’s Fusion GPS partner Thomas Catan, who grew up in Britain, once edited a business magazine in Mexico, moreover. A third founding partner, Glenn Simpson, is reported to have shared dark views of both Russian President Vladimir Putin and Trump. Before joining Fusion...