U.S. President Donald Trump has tasked his economics team with devising plans for reciprocal tariffs on every country that taxes U.S. imports, raising the risk of a global trade war with American friends and foes.

President Trump is threatening to levy taxes on imports to match those other countries charge on U.S. exports.

The rapid-fire shots of tariffs and import curbs hearken back to Trump’s first term in office, when the U.S. and China engaged in a trade war that spanned most of Trump’s first four years in office and was continued to a certain extent under his successor, Joe Biden.

Existing American tariffs already restrict steel and aluminum shipments from China, which is now flooding other markets with its exports instead.