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Photo illustration: Sarah Grillo/Axios. Photos: MPI and Chris Brunskill/Fantasista via Getty Images

President Trump has revived a provision from one of former President Herbert Hoover's most infamous policies: the Smoot-Hawley Tariff Act of 1930.

Why it matters: Smoot was long thought to be moot — widely considered a failure and, possibly, an exacerbating factor in the Great Depression.