by Calculated Risk on 7/13/2011 05:07:00 PM

From Moody's: Moody's Places US Aaa Government Bond Rating and Related Ratings on Review for Possible Downgrade

Moody's Investors Service has placed the Aaa bond rating of the government of the United States on review for possible downgrade given the rising possibility that the statutory debt limit will not be raised on a timely basis, leading to a default on US Treasury debt obligations. On June 2, Moody's had announced that a rating review would be likely in mid July unless there was meaningful progress in negotiations to raise the debt limit.
...
The review of the US government's bond rating is prompted by the possibility that the debt limit will not be raised in time to prevent a missed payment of interest or principal on outstanding bonds and notes. As such, there is a small but rising risk of a short-lived default.

Moody's considers the probability of a default on interest payments to be low but no longer to be de minimis. An actual default, regardless of duration, would fundamentally alter Moody's assessment of the timeliness of future payments, and a Aaa rating would likely no longer be appropriate.

No surprise.