The European Commission has threatened to slap duties on some of America's best-known products in response to US plans to increase tariffs on aluminium and steel imports.

Commission President Jean-Claude Juncker says Harley Davidsons, bourbon, and Levi jeans all could be hit with a 25 percent tariff if US President Donald Trump follows through on his promise.

A list of countries like Canada, Mexico, China, Australia and Brazil have also vowed to retaliate.

Al Jazeera's Kimberly Halkett reports from Washington, DC.

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