Rubio said the U.S. tariffs imposed on many Asian countries, including the heaviest levies on China, were a top complaint at the summit.

Rubio called it a "very constructive and positive" meeting. He hinted at a possible meeting between President Donald Trump and Chinese President Xi Jinping.

The two major powers vied to push their agendas in Asia at a time of simmering tension over a U.S. trade tariffs offensive.