The head of Standard & Poor's sovereign ratings said Sunday that the agency may downgrade the U.S. again.

"Given the economic and political situation in the U.S., which will we see, an upgrading back to AAA or further downgrades?" Fox News' Chris Wallace asked David Beers.

"We have a negative outlook on the rating and that means we think that the risk currently for the rating are to the downside," Beers said.