Trump heads to China, says no need for Xi's help on Iran war

By Nandita Bose and Jana ChoukeirWASHINGTON/DUBAI, May 13 (Reuters) - U.S. President Donald Trump headed to China on Wednesday for a high-stakes summit with President Xi Jinping, saying he does not expect to need Beijing's help to end the war with Iran and ease Tehran's grip on the Strait of Hormuz.Speaking before departing Washington, Trump played down the role China could have in resolving the conflict, which has continued to block maritime traffic through a waterway that normally carries one-...