Only those watching the bond market closely would have noticed it, but a huge Treasury meltdown may have started yesterday. One month US Treasury bills saw yields jump an eye-popping 10 basis points in an instant. The incident followed one of the worst Treasury Bill auctions in a decade, where there was little demand from investors. The two possible answers for the terrible auction are the unusual date (it was moved because of the Fourth of July), or that China has indeed slowed or cut off its purchases of US debt.
FINSUM: The US better hope this bad auction was just a fluke of the calendar. That view is supported by the fact that longer-term Treasury auctions at the same time were much closer to normal.