mexico city mexico increase dialogue american company make case bilateral economic tie senior official say thursday effort counter anti-mexican rhetoric u.s. presidential campaign presumptive republican nominee donald trump say mexico kill u.s. trade threaten build border wall keep migrants block remittances send home mexicans raise tariff mexico protect u.s. job generally pain avoid address trump directly mexican government officials warn proposals could serious damage nations economies paulo carreno mexico new deputy foreign minister responsible north america appoint april lead drive bolster country stand unite state since mexico diplomatic network unite state step efforts reach business leaders well politicians academics carreno say keen stress government take side presidential contest company mexico meet majority agree model bilateral economic cooperation base free trade involve border wall protective tariff say understand benefit great commercial integration live way say carreno agree model today good one though course say improve u.s.-mexico trade worth 500 billion every year u.s. chamber commerce say roughly million american job depend addition estimate 35 million people unite state mexican mexican background mexican business leaders say u.s. company crucial ally battle counter trump arguments carreno detail company mexico meet though senior officials say previously major operations south border key interlocutors include firm like general electric well carmakers general motor ford carmakers attack trump campaign invest mexico mexico step dialogue u.s. firm economy minister