trump has cancelled  Pompeo's visit to N. Korea.  He's now publicly saying N. Korea isn't following the agreement to denuclearize.  Negotiations have been stalled since the great summit in Singapore.  trump is blaming China, of course.  "Because of our much tougher trading stance with China, I don't believe they're helping with the process of denuclearization as they once were,"  trump tweeted.  Such a shock!