China warned the Trump administration on Tuesday against reigniting trade tension by restoring tariffs on its goods next month, and threatened to retaliate against nations that strike deals with the United States to cut China out of supply chains.

China cautioned the Trump administration against re-escalating trade tensions by re-imposing tariffs on Chinese goods next month. Beijing also threatened retaliation against countries that forge deals with the United States aimed at excluding China from supply chains.

President Donald Trump has threatened steep tariffs on America’s trading partners, sending letters to more than a dozen world leaders, warning they have less than a month to strike a deal.