Credit rating downgrade triggers warning signs for U.S.

The growing size of the U.S. debt, and the concerns over how much more it will increase, is very much on the minds of investors, markets and lawmakers. The developments were tied in part to Moody’s announcement that it was downgrading the U.S. credit rating over concerns about large annual deficits, debt and rising interest costs. Amna Nawaz discussed more with David Wessel.