Trump has repeatedly called April 2 “Liberation Day,” with promises to roll out a set of tariffs, or taxes on imports from other countries, that he says will free the U.S. from a reliance on foreign goods. To do this, Trump has said he’ll impose “reciprocal” tariffs to match the duties that other countries charge on U.S. products.

Vietnam cut import duties on Monday while other governments like Japan and Australia have tried negotiating with Washington.

The president is expected to unveil details of his plans for a wider set of import taxes. But what tariffs and when?