arlington va. trump administration friday demand u.s.-made content account half value cars truck sell north american free trade agreement raise doubt potential deal renew pact three source brief protectionist u.s. proposal line president donald trump goal shrink trade deficit mexico stem loss u.s. manufacture job say also seek sharply high north american automotive content overall proposal make contentious talk washington fourth seven plan round negotiations overhaul treaty mexican source denounce absurd juan carlos baker mexico deputy economy minister put brave face state nafta negotiations halfway point question difficult proposals baker tell reporters mexico embassy washington say mexico consider though say clear us certain things proposals go country objectives trump claim original 1994 pact disaster unite state threaten walk away agreement unless major change make washington auto industry gambit come hot heel demand nafta also contain so-called sunset clause could mean new deal expire five years idea canada mexico also strongly oppose although source brief talk describe mood sour mexican canadian politicians say question leave table collapse nafta would wreak havoc throughout north american economy disrupt highly integrate manufacture supply chain agricultural export steep tariff would snap back place trade among three countries quadruple since 1994 1.2 trillion annually source close talk say washington want increase north american content requirement truck autos large engines 85 percent 62.5 percent period years addition insistence 50 percent products use vehicle u.s.-made within first year sign deal proposal also require steel aluminum copper plastics electronics part source north america vehicles qualify nafta tariff-free status trump make clear prefer bilateral trade deal skeptics wonder whether u.s. demand part america first strategy design ensure current talk fail u.s. chamber commerce list demand great use u.s.-made products vehicles among number poison pill proposals say would torpedo talk nl4n1ml4jw chamber say proposal would cost job since automakers part suppliers would likely forgo nafta benefit simply pay 2.5 percent u.s. tariff import cars many part unifor union represent canada auto workers say u.s. proposals deliberately untenable frankly think bully move american government unifor president jerry dias say statement trump officials say current rule lax allow auto company bring many cheap part china low-wage asian countries mexico heavily dependent unite state nafta economic viability uncertainty outcome talk help push mexican peso near five-month low week canadian officials say soon write deal-making process note u.s. trade representative robert lighthizer canadian foreign minister chrystia freeland mexican economy minister ildefonso guajardo due meet washington tuesday take stock negotiations separately u.s. negotiators friday formally ask canada address bilateral dispute dairy price request canadians set resist source familiar talk say u.s. stance auto industry sow doubt nafta overhaul