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.

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.

Trump has vowed to impose tariffs of as high as 60% on China, as well as lesser ones with the US’ biggest trade partners, threats that could upend global trade and economic growth.