President Donald Trump’s three-day summit in Beijing with Chinese President Xi Jinping appeared seamless on the surface, marked by lavish, tightly choreographed ceremonies and public expressions of mutual interest in strengthening ties . Behind the scenes, however, tensions were on full display between Chinese officials and the U.S. Secret Service and American journalists, according to a Fox News reporter . Peter Doocy, the network’s White House correspondent, revealed in a series of interviews that “heated and physical clashes” took place on the periphery of Trump and Xi’s bilateral discussions . Speaking to Fox News host Martha McCallum on Thursday, Doocy detailed one incident — described as a “very physical standoff” — between Chinese police and Secret Service personnel at “the backdoors” of one event.…