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Trump reportedly told those who gathered, including members of the press, that it was the "honor" of his lifetime.
"It's been the honor of my life to serve this Nation, and I will do all I can to ensure everyone has an equal opportunity to achieve and maintain health," said Adams
President-elect Joe Biden and Vice President-elect Kamala Harris will take their oaths of office at the Capitol at noon on 20 January.
Given Trump's decision not to attend the inauguration, experts speculated that the president would buck the tradition of leaving a note for his successor, but he proved them wrong on Wednesday.
The Chinese government's top political adviser called on Taiwan affairs staff to produce "outstanding achievements."
Trump chose not to issue pardons for himself of his personal attorney, former New York Mayor Rudy Giuliani.
Kremlin spokesman Dmitry Peskov said "it is only possible to welcome" a U.S. move to extend the arms reduction treaty, which expires on February 5.
"This was something—the 5-year ban—that I've been talking about a lot on the campaign trail, and we are now putting it into effect," Trump said when he first signed the order on January 28, 2017.
Trump came through on delivering a new coronavirus vaccine in record time, but the administration overpromised and underdelivered on getting it into people's arms.
President Donald Trump issued dozens of pardons and commutations on his last full day in office.
The president did not issue pardons for himself, his children or for former New York Mayor Rudy Giuliani.
China's rock star entrepreneur, who co-founded e-commerce giant Alibaba Group, had not been seen in public since October.