It appears to be a specific provision of Section 337 of the Tariff Act of 1930 as modified by the Trade Act of 1974. Specifically, the U.S. Trade Representative

It appears to be a specific provision of Section 337 of the Tariff Act of 1930 as modified by the Trade Act of 1974. Specifically, the U.S. Trade Representative can disapprove of the ruling for policy (read: political) reasons. [1] However since she works for the President, the President can order the U.S. Trade Representative to execute this function of her office. [1] https://www.usitc.gov/press_room/us337.htm#:~:text=Under%20section%20337%2C%20the%20USITC,unlawful%20practice%20in%20import%20trade https://www.usitc.gov/press_room/us337.htm#:~:text=Under%20s....