Trump's memo says the price would not exceed the cost of processing applications, but officials did not immediately provide an estimate for what that might be.
Trump also said that he would tax cars from the European Union if they retaliated against his tariffs.
Trump had said he had "low expectations" for the meeting and tweeted that relations between the countries had never been worse, blaming the situation on the ongoing investigations into alleged collusion with Russia surrounding his 2016 election victory.
Trump has often used immigration as an issue to appeal to his political base. He pledged to build a wall along the Mexican border and enforced a travel ban from a number of Muslim-majority countries.
Tsang said some Western countries' politicians with such a mentality are attempting to demonize the authorities of the Chinese mainland and the HKSAR.
Trump, speaking at a press conference in New York on the sidelines of the United Nations General Assembly on Wednesday, threatened to tax cars imported "if Canada doesn't make a deal with" the United States.
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Trump is trying to convince Congress to sign off on a revised trade agreement with Mexico and Canada that his administration negotiated last year.
Trump and his top advisers have been negotiating with US lawmakers on Capitol Hill to try to change sanctions legislation so that he does not face a deadline on whether to recertify Iranian compliance with the nuclear deal every 90 days.
Trump's stimulus plan is still being developed, and the size of the package could grow. Initial proposals call for the total to include about billion to help airlines, and billions for general stimulus that could include a payroll tax cut.
Trump discharged, doffs mask - World - Chinadaily.com.cn