Trumpeting "America First", the current US administration has adopted a series of unilateral and protectionist measures, regularly wielded tariffs as a "big stick" and coerced other countries into accepting its demands, the white paper said.
Trump worked to escalate the showdown Friday, reissuing threats to close the US-Mexico border to pressure Congress to fund the wall and to shut off aid to three Central American countries from which many migrants have fled.
Trump said he had told one of his sons, who asked how bad the situation really is, that "It's bad, it's bad. But we are hopefully going to be a best case, not a worst case."
Tsang founded the famous manufacturer of menswear in 1968, and has steadily invested in the manufacturing industry on the mainland since the early days of the country's reform and opening-up.
Trump also criticized Democratic front-runner Joe Biden and former president Barack Obama, saying they didn't do enough to protect American manufacturing.
Trump is a vocal supporter of Britain's attempts to leave the 28-member trading bloc, and has also spoken of how trade between Italy and the US, which has a huge expatriate Italian community, is being held back by "burdens, as unfair as they are, imposed by the European Union".
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Trump said earlier this week that he has recommended that "bump stocks," devices that enable semi-automatic weapons to fire hundreds of rounds per minute, be banned.
Tsang said he hopes the dangerous mentality will stop, adding that otherwise, it will be catastrophic for the whole world.
Trump has been widely attacked after his Helsinki meeting with Putin, due to his reconciliatory remarks that many saw as a sign to side with Moscow against US intelligence community's conclusion that Russia meddled in the 2016 US elections.
Trump arrived in Tokyo on Saturday afternoon and is expected to hold an official meeting with Japanese Prime Minister Shinzo Abe on Monday.