The U.S. Postal Service’s decision may block or delay parcels from retailers including Shein and Temu from entering the United States.

As part of a 10% tariff on Chinese imports, Trump also scrapped a rule that waived import duties on packages valued at under $800, which helped Temu and Shein.

The USPS halted an order to suspend incoming packages from China that threatened to severely disrupt trade between the two major economies.