U.S. President Donald Trump still plans to make good on his promise to issue tariffs on Canada and Mexico on Saturday, White House spokeswoman Karoline Leavitt said on Tuesday.

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 repeatedly insisted that tariffs are coming on Canada and Mexico, despite both countries seeking to address his stated concerns about illegal border crossings and the smuggling of fentanyl. But the Republican president is also motivated by the idea that tariffs would force other countries to “respect” the United States.