cbs' anna coren reports from hong kong. . >> reporter: at the headquarters of hong kong post, a senseng to send my package to the u.s., and now i have to find another route. so i don't know what's going on. hopefully it will get fixed or sorted soon. >> reporter: what did they say to you? >> they just said it's suspended. >> reporter: in a surprise announcement, the u.s. postal service said it was suspending all packages from hong kong and china. it comes as part of president trump's decision to enforce new tariffs on china. he has also scrapped the so-called de minimis exemption, a trade loophole that allowed packages valued at less than $800 to be duty free from china. for years, u.s. customs and border patrol have raised concerns over the increasing volume of packages that go unchecked. trump has seized on that, claiming this is one of the ways that fentanyl gets into the country. and china's refusal to stem the flow of fentanyl, according to the president, is the reason for the 10% tariffs. >> i think you need some reason to start that kind of a negotiating and dialogue. >> report