U.S. President Donald Trump has pledged to place 25% tariffs on imports from Mexico and Canada from Feb. 1 if the two countries are not judged to be doing enough to stop the flow of fentanyl into the United States.

General Motors, the largest producer of cars in Mexico, won’t provide details on how it would react if President Trump imposes 25 percent tariffs from the two countries.

Trump has said he is considering imposing 25% tariffs on both countries by 1 February. He has previously tied the tariffs threat to ending illegal migration and drugs crossing into the US through its southern and northern borders.