President Donald Trump could announce his reciprocal tariff plan before he meets with Indian Prime Minister Narendra Modi on Thursday, the White House said.

Here’s what you need to know about reciprocal tariffs and who might be impacted by Trump’s plan. Reciprocal tariffs refer to tariffs—the taxes charged on imported goods—the U.S. government plans to levy against global trading partners that are equal to the existing tariffs foreign countries have set against American goods.