China’s tit-for-tat duties on U.S. imports took effect Monday, just hours after U.S. President Donald Trump announced that he wants to slap new duties on all steel and aluminum imports to the U.S. The rapid-fire shots of tariffs and import curbs hearken back to Trump’s first term in office,

Trump has long proposed raising tariffs—or taxes on imported goods that the businesses importing them pay the U.S. government—before the election, and said in November he’ll impose a 25% tariff rate on all imports from Mexico and Canada on the first day of his presidency and will impose an additional 10% tariff rate on all imports from China on top of other tariffs.

Beijing hit back with its own tariffs and export restrictions after being subjected to levies by President Trump. Trade experts said China appeared to aim for minimal short-term harm while showing the range of its possible responses.

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,