US President Donald Trump’s first wave of copper tariffs will hit imports valued at more than $15 billion last year, highlighting the potential inflationary impact on American manufacturers.

President Donald Trump signed executive actions on Wednesday implementing a crippling 50% tariff on Brazil as well as a 50% tariff on certain copper products, the White House said, in the latest escalation of his administration’s aggressive trade war.

In a flurry of trade news on Wednesday, Trump imposed new rates on copper imports and ended the de minimis exemption.