Traders also think it is likely that the president will talk about Iran, despite his comments that the U.S. doesn't need China's help in resolving the war.

The first US presidential visit to China in almost 10 years will test a fragile tariff truce.

Taiwan, tariffs and the strait of Hormuz are on the meeting’s agenda for Beijing – but will the US president be forced to ask for help in ending his war with Iran?