President Donald Trump said the US would begin levying a 50% tariff on copper imports from Aug. 1, confirming a move that will batter producers of everything from automobiles to homes and appliances who rely on the industrial metal.

The president was following through on an earlier statement that he would target a key metal used for semiconductors, lithium ion batteries and more.

U.S. President Donald Trump announced on Wednesday a 50% tariff on copper, saying on social media that it would be effective August 1 and that the decision was made after a national security assessment.