Detroit automakers are preparing to tell the Trump administration that proposed changes to the North American trade deal could add billions of dollars to their costs and weaken their position against foreign competitors. The main flashpoint is Washington’s push to require at least 50% U.S.-made content in vehicles seeking lower tariffs, alongside a proposal to raise overall North American vehicle content above the current 75% threshold. Estimates at two automakers put the added burden at at least $2 billion a year for each Detroit carmaker, on top of tariff costs already absorbed from levies on steel, aluminum, auto parts and vehicles imported from Mexico and Canada. General Motors expects gross tariff-related expenses of $2.5 billion to $3.5 billion this year, while Ford Motor has put its net tariff hit at about $1 billion. The debate comes as Ford said it will shift production of Lincoln models for the U.S. market from China to U.S. factories, citing tariffs, and as U.S., Mexican and Canadian officials prepare further trade talks. The American Automotive Policy Council says U.S. automakers are disadvantaged because Japanese, South Korean and European rivals exporting into the United States face a flat 15% tariff, while Detroit automakers contend the current structure leaves them with heavier tariff burdens despite their regional manufacturing footprint.