Marco Rubio will become the first sitting US Secretary of State under Chinese sanctions to visit Beijing. Images of Rubio leaving for China on Air Force One with Donald Trump appear to have answered previous questions about whether he would skip such a globally important event. Rubio is also serving as the US National Security Adviser and would normally have been expected to visit China to lay the groundwork for such a high-stakes summit. Instead he has met his Chinese counterpart Wang Yi twice.