Tsang said he hopes that dangerous mentality will stop, adding that otherwise, it will be catastrophic for the whole world.
Trump's action immediately brought new charges that the president intervenes freely in the US justice system to help friends and allies and punish critics and perceived enemies.
Trump's visit to China from Wednesday to Friday will be the first by a head of state to China since the Communist Party of China's 19th National Congress, which ended on Oct 24, and it comes at a significant moment in China-US relations, said Zheng Zeguang, vice-foreign minister.
Trump denies any wrongdoing and describes the impeachment as a hoax.
Tsinghua teaming up with Imperial College London to support projects Tsinghua University and Imperial College London have launched a joint fund to support bold scientific ideas in their early stages.
Tsang was sentenced to 20 months in prison on Feb 22, 2017 for misconduct while in office and was sent to prison immediately.
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Trial runs of the 5G network, backed by telecom carrier China Mobile, officially started Saturday in Shanghai's Hongkou district, where 5G base stations had been deployed over the last three months to ensure full coverage.
Trump's letter came a day after Pelosi wrote to the president suggesting he postpone his Jan 29 State of the Union address "given the security concerns and unless government reopens this week", amid a stalemate that has shuttered large parts of the federal government since Dec 22, the longest closure in US history.
Trump has called for companies to build more products in the United States and open additional plants. He has made several announcements since his election in November about US investments by both foreign and domestic manufacturers, building on his campaign focus on boosting American jobs. Some of those announcements sought to take credit for previously announced investments.
Trump's surprise exit from the talks came shortly after the DPRK dismantled its nuclear test site in front of international journalists, a move that Republic of Korea authorities said was the "first step toward complete denuclearization of the peninsula".