President Donald Trump will move forward with aggressive new tariffs on Canada, Mexico and China on Saturday, the White House said, affirming he will stick to his February 1 deadline for the new duties that could have widespread effects on the economy.

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.

China "firmly opposes" Trump's new duties, a spokesperson for Beijing's embassy in Washington said, adding: "There is no winner in a trade war or tariff war, which serves the interests of neither side nor the world."