(CNN) The Trump administration is moving to raise postage rates for foreign companies that ship packages to the United States.

Some countries, including China, currently benefit from subsidized postal rates set by the Universal Postal Union, a United Nations agency.

On Wednesday, US officials will initiate a withdrawal process from the UPU, which was established in 1874 and has 192 member countries. The process to withdraw will take at least a year, and the administration intends to negotiate new rates with the group during that time.

Under the current rules, the UPU sets lower rates for developing countries. It makes it possible to mail a package from Beijing to New York for less than it costs to send it from San Francisco to New York, for example.

China, Singapore, Germany, France and some other countries benefit from the policy, said a senior White House official on a call with reporters.

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