Friday saw the president reopen the floodgates for millions of duty-free shipments from e-commerce firms like Shein and Temu.

The trade loophole is meant to ease small-scale sales — but critics say it's been abused and gives Chinese firms an unfair ...

Section 321, also known as de minimis, allows importers to avoid paying ... "They're used to not having to pay this money upfront before sales come, if at all," Barnett told Business Insider.