Trump seemed to have offered his blessing for what would be a fourth Moon-Kim summit when he and Moon noted Kim's visit to Seoul may create fresh momentum for their denuclearization efforts, according to Moon's chief press secretary, Yoon Young-chan.
The U.S. president also reaffirmed his commitment to meet Kim early next year. Trump met Kim in June in what marked the first-ever U.S.-North Korea summit.
Moon's departure also followed a series of bilateral meetings with other global leaders, including Dutch Prime Minister Mark Rutte and South African President Cyril Ramaphosa.
He also held the first South Korea-Argentina summit in 14 years with President Mauricio Macri earlier in the day.