Katie Zacharia may have lasted just five days as the White House press secretary but still managed to set off a diplomatic incident with China. In an interview with a conservative commentator on Thursday, Zacharia referred to China as a place that “doesn’t even have proper toilets”. Chinese foreign ministry spokeswoman Mao Ning responded a day later with a smile and a brief, pointed invitation. “We welcome her to visit China more often when she has the opportunity,” said Mao, a veteran...