In an announcement Wednesday, the department said the inquiry is focused on coated sheet completed in — and shipped to the U.S. from — Costa Rica, Guatemala, Malaysia, South Africa, and the United Arab Emirates. The department said it’s the first time it has launched a circumvention inquiry on its own volition — inquires typically arise from complaints from domestic manufacturers — and its first self-initiated, multi-country circumvention inquiry.

The department said it launched the inquiry based on its own monitoring of trade flows. It has noted that the value of corrosion resistant shipments from those countries has grown from 629% to 35,944% in the 45 months before and after duties on Chinese and Taiwanese-made corrosion-resistant sheet were imposed.

“The strict enforcement of U.S. trade law is a primary focus of the Trump administration,” the department said in a statement. “These actions demonstrate Commerce’s vigilance to stop circumvention of U.S. trade laws, wherever it occurs.”