U.S. President Donald Trump said on Tuesday he intends to impose auto tariffs "in the neighborhood of 25%" and similar duties on semiconductors and pharmaceutical imports, the latest in a series of measures threatening to upend international trade.

"It will be 25% and higher, and it will go very substantially higher over a course of a year," Trump said on Tuesday.

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.