The president appeared to be acting rationally and strategically. Apparently not.Photo: Win McNamee/Getty Images I wrote on Wednesday that “the punitive China tariffs may soon be five times as large as they were during their first year” due to President Trump’s actual and threatened actions to apply tariffs to more Chinese imports and at a higher rate of 25 percent. Now he has escalated again, threatening tariffs up to 25 percent on all Mexican imports. On a first approximation, that means Trump has gone from threatening a five-times escalation of his preexisting trade war to threatening an...