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Customs and Border Protection processes “nearly 4 million duty-free de minimis shipments a day,” most of them coming from China and Hong Kong, a spokesperson for the agency told CNN.

Temu, based in China, raised prices in recent days after Trump hiked tariffs and closed a loophole that allowed duty-free shipments to the U.S.

Major retailers have welcomed the government's review of a rule that allows small parcels to enter the UK duty-free, saying it gives overseas firms such as Shein and Temu an unfair advantage over British businesses.

Under the Canadian system, US dairy goods can enter the country duty-free or with very low tariffs - until certain quotas are exceeded.

Since 2000, certain African countries had duty-free access to the US market for a raft of goods including clothing and textiles, cocoa products and wine, as well as crude oil.