As U.S. President Donald Trump landed in Beijing last Wednesday for a two-day summit with his Chinese counterpart Xi Jinping, his aides would have been acutely aware that he had faced extensive criticism in the past for his cosy dealings with the Chinese leader before, especially during his first presidential term. The fact that the summit had been postponed from late March, following the escalation of the war in Iran, will have naturally raised at least one potential topic of conversation, if not two.