Industry groups were furiously seeking any scrap of information on how Trump plans to implement the tariffs — whether he would impose the full 25% with immediate effect, or announce them and delay their implementation to allow some time for negotiations over steps that the countries could take.

He will decide by the end of the day whether tariffs will also be slapped on crude oil imports.

Trump also signaled potential future tariffs on the European Union, accusing the bloc of unfair treatment toward the United States.

Trump had been threatening the tariffs to ensure greater cooperation from the countries on stopping illegal immigration and the smuggling of chemicals used for fentanyl, but he has also pledged to use tariffs to boost domestic manufacturing and raise revenues for the federal government.