Move will damage online sellers
New York Times report
"President Trump plans to withdraw from a 144-year-old postal treaty that has allowed Chinese companies to ship small packages to the United States at a steeply discounted rate"
The withdrawal will allow the US to impose higher shipping rates on China.
"Administration officials said they were assessing rates for other countries and had not made any decisions about whether the policy would extend beyond China," the report says.
Reading the story, I expect this will be a popular move politically but at the same time, it will drive prices higher.