Investigative author Peter Schweizer alleges the Mexican government is operating a coordinated influence effort inside the United States, using diplomatic missions, education programs and migrant outreach initiatives in ways he argues go far beyond traditional diplomacy. In an interview with Fox News Digital, Schweizer said his forthcoming book, “The Invisible Coup,” available Tuesday, documents what he describes as “weaponized immigration,” a strategy he claims Mexican officials view as a means to exert political leverage inside the U.S. “Foreign powers are using migration as a weapon to undermine American sovereignty,” Schweizer said. “Mexico is a clear example of this.” Schweizer pointed...