The US is unlikely to see its long-term credit rating return to AAA any time soon, ratings agency S&P has said.
Its comments came as it downgraded the state-backed mortgage giants Fannie Mae and Freddie Mac because of their "direct reliance on the US government".
It also lowered ratings for clearing houses and other institutions linked to long-term US debt from AAA to AA+.
Late on Friday, the agency downgraded the US's top-notch AAA rating for the first time in its history.