U.S. businesses of varying sizes will use public hearings this week to urge the Trump administration to reverse tariffs on nearly $50 billion in Chinese imports.

The Office of the U.S. Trade Representative will hold the first of three sessions on the proposed duties – which could affect more than 1,300 categories of products from automotive parts to semiconductors and medical equipment – on Tuesday. The assessments followed the president’s decision to impose separate levies of 25 percent on steel imports and 10 percent on aluminum, moves that frustrated a number of U.S. allies.