Chinese companies moved production to Mexico to have tariff-free access to the US market under the USMCA trade deal. With President-elect Donald Trump now threatening tariffs, these companies and their Mexican hosts are planning their options if the trade restrictions come.

China has strengthened trade with Latin America at the expense of the U.S. But Donald Trump, who threatens to raise tariffs on Mexico, could upend those ties.

The migration of manufacturing to Mexico could undermine Trump’s promise to voters that ratcheting up tariffs on China would incentivize companies to bring production back to the U.S and give American companies a more even playing field.