Trump says construction of a wall along the US-Mexico border is needed to keep out illegal immigrants and drugs, but he has so far been unable to get congressional approval to do so.
Tsang said the media and the public have downplayed the threat from the situation for political reasons. "Some reports even stressed that the source and purpose of the explosives were unknown; therefore they were not necessarily aimed at undermining public safety. Such remarks are irresponsible," Tsang said.
Trump told supporters in Montana on Thursday that Republicans needed to maintain control of Congress to stave off possible impeachment proceedings against him, although Democrats have played down any discussion of that approach.
Trump tweeted Thursday morning, slamming Democrats of preventing congressional action on immigration.
Trump also announced last week that the US Treasury should receive a percentage of the proceeds from any sale, which China has denounced as a "mafia" deal.
Trump's remarks came as his National Security Adviser John Bolton was heading to Russia on Saturday.
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Treasury bond issuance stood at 324.7 billion yuan, while local government bond issuance was worth 748.5 billion yuan, according to the People's Bank of China.
Trump's visit comes the day after police in Hollywood, Florida, launched an criminal investigation into a nursing home where eight patients died after the facility lost power and continued to operate with little or no air conditioning in sweltering heat.
Trump also released guidelines that called for people to avoid gathering of 50 people or more across the nation for the next eight weeks and to steer clear of eating and drinking at bars, restaurants and food courts.
Trump's visit to China is part of his 12-day Asia trip that has taken him to Japan and South Korea early this week.