A divided U.S. appeals court has ruled most of Donald Trump's tariffs are illegal, undercutting the Republican president's use of the levies as a key international economic policy tool.⁣ ⁣ The tariffs will remain in place until October 14 to give the Trump administration a chance to file an appeal with the U.S. Supreme Court.⁣ ⁣ Trump slammed the decision, saying: "If these tariffs ever went away, it would be a total disaster for the country." He predicted a U-turn though "with the help of the Supreme Court."⁣ ⁣ The ruling affects Trump's "reciprocal" tariffs, imposed as part of his trade war in April, as well as a separate set of levies applied in February against China, Canada and Mexico.⁣ ⁣ In a 7-4 decision, the court rejected Trump's argument that the tariffs were permitted under an emergency economic powers act, calling them "invalid as contrary to law".⁣ ⁣ Trump has made tariffs a pillar of U.S. foreign policy in his second term, using them to exert political pressure and renego...