Tsang Kwok-wai was appointed Secretary for Constitutional and Mainland Affairs, replacing Nip Tak-kuen.
Trump reissued his call for Congress to pass new stimulus legislation, saying in a tweet that he was "ready to sign" a bill.
Trump reacted on the same day by calling Cohen "a weak person and not a very smart person." "Very simply, Michael Cohen is lying, and he is trying to get a reduced sentence for things that have nothing to do with me," the president said.
Trump tweeted on Sunday that China is "dreaming" that Biden gets elected in 2020.
Trump was scheduled to hold a news conference at the White House at 3 pm on Friday.
Trump has touted the coming plan as the "deal of the century," but Palestinian officials have rebuked the US effort, which they believe will be heavily biased in favor of Israel.
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Trump has complained frequently that the United States is treated unfairly in global trade and has sharply criticized the WTO for letting that happen.
Tse, an assumed name, was a "satellite baby", which refers to children born in the US to Chinese immigrant parents who are sent to China as infants and raised by relatives - typically grandparents - and then returned to the US to start school when they are 5 or 6.
Trump, who is spending the weekend at his golf property in New Jersey, said in a tweet on Saturday that Saudi Arabia's King Salman bin Abdulaziz Al Saud had agreed to produce more oil.
Trump owns a resort in Palm Beach, Florida, where he has often traveled during his presidency, as well as three golf courses in the state.