Trump threatens to double tariffs on China and says punishing Mexico and Canada tariffs will go into effect March 4

President Donald Trump said Thursday tariffs of 25% on Mexican and Canadian goods are set to take effect on March 4, while also threatening to impose an additional 10% on Chinese imports on the same date.

​ President Donald Trump said Thursday tariffs of 25% on Mexican and Canadian goods are set to take effect on March 4, while also threatening to impose an additional 10% on Chinese imports on the same date. Read More Breaking News, Latest News and Videos | CNN