pipeline when "all in" starts right now. good evening from new york. i'm chris hayes. 46 days until he's sworn in as president of the united states, donald trump is back to one of his signature moves from the campaign trail, engaging in a public feud. during the campaign, trump feuded with everyone from an ex-beauty queen to a judge to the elder statesman of his own party. feuds have been part of his reality persona going back years. think about his long-time beef with rosie o'donnell. never back down, never surrender. in this case, however, this is not a private individual or political opponent. it's the nation of china. nuclear armed power with a population of almost 1.4 billion, the world's second largest economy after the u.s. and our number one trading partner and largest owner of u.s. debt. in fighting this battle, trump may be rewriting delicate