let's bring in greg sullivan with the latest. we usually hear these kinds of comments from the president when trade tensions are high with china. what is the significance of linking china and south korea this time around? has linked china and south korea with north korea issue. the u.s. has failed to show progress. what is interesting is that instead of placing the blame on frustrated, they are by influence. trying to bring north korea to the table. some of that frustration could be coming into play. either way, it is clear he is frustrated with the pace of