Trump and First Lady Melania were welcomed at the Imperial Palace in Tokyo by Emperor Naruhito and Empress Masako.
Tsang actively promoted the city's cross-border police cooperation with many foreign countries, including the US, Canada, Australia and New Zealand, when he was Hong Kong's police chief from 2011 to 2015.
Trump also wants to bar anyone who has entered or tried to enter the country illegally from receiving a provisional work permit and is calling on officials to immediately revoke work authorizations when people are denied asylum and ordered removed from the country.
Trump announced his intention to replace Tillerson with Pompeo, chief of the Central Intelligence Agency (CIA), on March 13.
Trump has vowed to return to campaigning shortly and to participate in the second presidential debate against opponent Joe Biden in Miami on October 15.
Trump tweeted on Saturday evening that the US had the "absolute legal right to have apprehended illegal immigrants transferred to Sanctuary Cities".
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Trump campaign events postponed or virtual after COVID diagnosis - World - Chinadaily.com.cn
Trump, when asked if he wanted Tillerson to stay on the job on Thursday morning, made a simple reply.
Trump said at the beginning of his speech that he had invited some of his "very good friends", and the room is limited, but "everybody wanted to come. We kept it down to a minimum."
Trump has launched legal challenges in multiple states and claimed that he has won the election, although the challenges so far have not yielded any changes in the outcome. His administration has refused to recognize Biden as the winner, blocking Biden's transition team from funding and office space and from receiving classified briefings.