President Donald Trump on Friday reversed his decision to eliminate the “de minimis” loophole that allowed packages from China valued at under $800 to be processed without customs duties or tariffs, a component of the 10% tariff on Chinese imports that took effect Tuesday—a move that threatened discount Chinese retailers Temu and Shein.

A decision by President Trump to close a tariff loophole could change the landscape of online shopping, particularly for the Chinese e-commerce companies behind wildly successful sites, such as Shein and Temu.

Ultra-cheap clothing from China could get more expensive under President Trump's new tariffs, and help Amazon edge out competition from overseas. An additional 10% tariff on all Chinese goods went into effect on Tuesday, the same day President Donald Trump agreed to pause tariffs against Mexico and Canada for 30 days.