Tsang cited similar arrangements in other jurisdictions and the existence of such agencies in pre-handover Hong Kong.
Tsukuba has since grown tremendously, becoming home to 147 research institutes and 227,000 people, according to Zhou.
Trump said he was not concerned if the remarks were construed as racist.
Trump said that he highly values the good working relationship and personal friendship with President Xi and he is willing to continue to maintain close contact with President Xi to push forward the US-China relations.
Trump also said he promised to raise with Kim the subject of Japanese citizens abducted by DPRK, after Abe focused on the issue during their meeting early in the day.
Trump's hardline policies on immigration have been a key element of his presidency and 2020 re-election campaign.
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Trump dished out sharp one-liners throughout his comments on Saturday night, occasionally lapsing into recurring themes about the 2016 election and media bias.
Trump has denied any collusion and repeatedly slammed the Russia probe as a "witch hunt." Moscow has also denied any meddling. So far, 34 individuals and three companies have pleaded guilty, been indicted or otherwise swept up in the inquiry, including several former Trump advisers.
Trump made the remarks at the Joint Base Andrews near Washington on his way to Houston, minutes after the delegation from Pyongyang led by Kim Yong-chol, vice chairman of the DPRK's ruling Workers' Party of Korea Central Committee, started talks with US Secretary of State Mike Pompeo in New York.
Tsang Kwok-wai was appointed Secretary for Constitutional and Mainland Affairs, replacing Nip Tak-kuen.