By Dietrich Knauth and Nate Raymond

NEW YORK (Reuters) -A U.S. appeals court ruled on Friday that 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 court allowed the tariffs to remain in place through October 14 to give the Trump administration a chance to file an appeal with the U.S. Supreme Court.

Trump has made tariffs a pillar of U.S. foreign policy in his second term, using them to exert political pressure and renegotiate trade deals with countries that export goods to the United States.

The tariffs have given the Trump administration leverage to extract economic concessions from trading partners but have also increased volatility in financial markets.

“The statute bestows signifi

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