detroit u.s. republican presidential front-runner donald trump say move ford motor co f.n build manufacture plant mexico absolute disgrace show need renegotiate north american free trade agreement nafta early tuesday ford confirm plan build plant san luis potosi investment 1.6 billion transaction absolute disgrace say trump statement send reuters email dishonest politicians special interest control laugh face american citizens trump say deal like one michigan-based ford make build plant mexico continue renegotiate nafta create fair deal american workers ford immediate comment trump statement two weeks ago chief executive mark field say ford would back away foreign investments make sense global multinational company invest keep us competitive make sense business field say ford currently workers make vehicles u.s. plant detroit rival general motor co gm.n fiat chrysler automobile fcau.n fcha.mi few workers make few vehicles mexico automakers gm 12,000 hourly pay workers mexico fca 9,547 ford 6,191 company say tuesday unite state ford 55,300 hourly pay plant workers gm 54,000 fca 36,600 company say 2015 80 percent ford north american production come u.s. plant 63 percent gm north american production come u.s. plant fca 64 percent north american production come u.s. plant trump call ford build plant mexico 'an absolute disgrace