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.

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.

American buyers rushed to stockpile Chinese goods before Donald Trump returns to the White House with a threat to impose tariffs of between 10 and 60 percent.